Add finalPackage option to move out config implementation.

modules/nvim-lazy/default.nix

@@ -316,12 +316,20 @@ in
       description = ''
         If set to true nvim will be installed with the plugins defined in programs.nvim-lazy.plugins.
       '';
+    };
 
     package = lib.mkPackageOption pkgs "neovim" {
       default = "neovim-unwrapped";
     };
 
+    finalPackage = mkOption {
+      type = types.package;
+      readOnly = true;
+      description = ''
+        Neovim wrapped.
+      '';
     };
+
     defaultEditor = mkOption {
       type = types.bool;
       default = false;