Let's try it with a file, else we'll have to make it a string in the config file

home-manager/shared/shell/zellij.kdl

@@ -29,3 +29,38 @@ themes {
         white "#cad3f5"
     }
 }
+pane = {
+    default_tab_template {
+        children
+        pane size=1 borderless=true {
+            plugin location="file:${inputs.conduit.packages.${pkgs.system}.default}/bin/zjstatus.wasm" {
+                format_left   "{mode} #[fg=cyan,bold]{session}"
+                format_center "{tabs}"
+                format_right  "{command_git_branch} {datetime}"
+                format_space  ""
+
+                border_enabled  "false"
+                border_char     "─"
+                border_format   "#[fg=green]{char}"
+                border_position "top"
+
+                hide_frame_for_single_pane "true"
+
+                mode_normal  "#[bg=blue] "
+                mode_tmux    "#[bg=blue] "
+
+                tab_normal   "#[fg=green] {name} "
+                tab_active   "#[fg=red,bold,italic] {name} "
+
+                command_git_branch_command     "git rev-parse --abbrev-ref HEAD"
+                command_git_branch_format      "#[fg=blue] {stdout} "
+                command_git_branch_interval    "10"
+                command_git_branch_rendermode  "static"
+
+                datetime        "#[fg=#green,bold] {format} "
+                datetime_format "%A, %d %b %Y %H:%M"
+                datetime_timezone "Europe/Berlin"
+            }
+        }
+    }
+}

home-manager/shared/shell/zellij.nix

@@ -13,58 +13,58 @@
       session_serialization = true;
       theme = "catppuccin-macchiato";
 
-      themes = {
+      # themes = {
-        catppuccin-macchiato = {
+      #   catppuccin-macchiato = {
-          bg = "#5b6078";
+      #     bg = "#5b6078";
-          fg = "#cad3f5";
+      #     fg = "#cad3f5";
-          red = "#ed8796";
+      #     red = "#ed8796";
-          green = "#a6da95";
+      #     green = "#a6da95";
-          blue = "#8aadf4";
+      #     blue = "#8aadf4";
-          yellow = "#eed49f";
+      #     yellow = "#eed49f";
-          magenta = "#f5bde6";
+      #     magenta = "#f5bde6";
-          orange = "#f5a97f";
+      #     orange = "#f5a97f";
-          cyan = "#91d7e3";
+      #     cyan = "#91d7e3";
-          black = "#1e2030";
+      #     black = "#1e2030";
-          white = "#cad3f5";
+      #     white = "#cad3f5";
-        };
-      };
-      pane = {
-        "plugin location= \"file:${inputs.zjstatus.packages.${pkgs.system}.default}/bin/zjstatus.wasm\"" = {
-          format_left = "{mode} #[fg=#89B4FA,bold]{session}";
-          format_center = "{tabs}";
-          format_right = "{command_git_branch} {datetime}";
-          format_space = "";
-
-          border_enabled = "false";
-          border_char = "─";
-          border_format = "#[fg=#6C7086]{char}";
-          border_position = "top";
-
-          hide_frame_for_single_pane = "true";
-
-          mode_normal = "#[bg=blue] ";
-          mode_tmux = "#[bg=#ffc387] ";
-
-          tab_normal = "#[fg=#6C7086] {name} ";
-          tab_active = "#[fg=#9399B2,bold,italic] {name} ";
-
-          command_git_branch_command = "git rev-parse --abbrev-ref HEAD";
-          command_git_branch_format = "#[fg=blue] {stdout} ";
-          command_git_branch_interval = "10";
-          command_git_branch_rendermode = "static";
-
-          datetime = "#[fg=#6C7086,bold] {format} ";
-          datetime_format = "%A, %d %b %Y %H:%M";
-          datetime_timezone = "Europe/Amsterdam";
-        };
-      };
-    };
-  };
-
-  # home.file = {
-  #   "zellij" = {
-  #     source = ./zellij.kdl;
-  #     target = ".config/zellij/config.kdl";
       #   };
       # };
+      # pane = {
+      #   "plugin location= \"file:${inputs.zjstatus.packages.${pkgs.system}.default}/bin/zjstatus.wasm\"" = {
+      #     format_left = "{mode} #[fg=#89B4FA,bold]{session}";
+      #     format_center = "{tabs}";
+      #     format_right = "{command_git_branch} {datetime}";
+      #     format_space = "";
+
+      #     border_enabled = "false";
+      #     border_char = "─";
+      #     border_format = "#[fg=#6C7086]{char}";
+      #     border_position = "top";
+
+      #     hide_frame_for_single_pane = "true";
+
+      #     mode_normal = "#[bg=blue] ";
+      #     mode_tmux = "#[bg=#ffc387] ";
+
+      #     tab_normal = "#[fg=#6C7086] {name} ";
+      #     tab_active = "#[fg=#9399B2,bold,italic] {name} ";
+
+      #     command_git_branch_command = "git rev-parse --abbrev-ref HEAD";
+      #     command_git_branch_format = "#[fg=blue] {stdout} ";
+      #     command_git_branch_interval = "10";
+      #     command_git_branch_rendermode = "static";
+
+      #     datetime = "#[fg=#6C7086,bold] {format} ";
+      #     datetime_format = "%A, %d %b %Y %H:%M";
+      #     datetime_timezone = "Europe/Amsterdam";
+      #   };
+      # };
+    };
+  };
+
+  home.file = {
+    "zellij" = {
+      source = ./zellij.kdl;
+      target = ".config/zellij/config.kdl";
+    };
+  };
 }