How to import additional configuration in programs.nixvim

how can i simply import additional configuration into programs.nixvim? i am getting `error: The option home-manager.users.username.programs.nixvim.import does not exist.`

```nix
programs.nixvim = {
enable = true;

import = [
  ./keymaps.nix
  ./luasnip.nix
  ./lsp.nix
  ./dashboard.nix
  ./trouble.nix
];
```
