Self-Referencing Nested Resource

I'm failing to set up a Resource where Pages can have subpages (of the same class). Is that somehow possible using a Nested Resources ?
I've set up a parent and children relationship on the Page-Model.
Following the docs I've managed to display child records but so far without a nested breadcrumb as the resource can't reference itself as $parentResource.
Am I missing something? What would be the Filament way to do this?
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