working maybe?

modules/editors/nixvim/default.nix

@@ -1,3 +1,28 @@
-_: {
-  imports = [./nixvim.nix];
+{
+  config,
+  lib,
+  inputs,
+  ...
+}: let
+  inherit (builtins) filter map toString elem;
+  inherit (lib.filesystem) listFilesRecursive;
+  inherit (lib.strings) hasSuffix;
+  inherit (lib.lists) concatLists;
+
+  mkNixvimModule = {
+    path,
+    ignoredPaths ? [
+    ],
+  }:
+    filter (hasSuffix ".nix") (
+      map toString (
+        filter (path: path != ./default.nix && !elem path ignoredPaths) (listFilesRecursive path)
+      )
+    );
+in {
+  imports = concatLists [
+    [inputs.nixvim.nixosModules.nixvim]
+
+    (mkNixvimModule {path = ./.;})
+  ];
 }