Laravel - how to make a search filter with like anything in relationship columns

I'm trying to make a query where returns me the results, based on a request word, but I have to filter with the relationship columns as well. Example:

Payment::byUnity($unityId)
            ->with(['contract:id,nome,sigla'])
            ->latest('id')
            ->where('id', 'LIKE', '%' . $request->input('search') . '%')
            ->orWhere('name', 'LIKE', '%' . $request->input('search') . '%')
            ->orWhere('contract.name', 'LIKE', '%' . $request->input('search') . '%')
            ->orWhere('contract.description', 'LIKE', '%' . $request->input('search') . '%')
            ->paginate(15)

How can I filter the "contract.name" on the query? Because the way of the example returns me error. Thanks in advance!

source https://stackoverflow.com/questions/67827348/laravel-how-to-make-a-search-filter-with-like-anything-in-relationship-columns