Related page with unconventional relation to parent

public function bookmarks(): HasMany
    {
        return $this->hasMany(Bookmark::class);
    }

  public function buyer(): BelongsTo
    {
        return $this->belongsTo(Contact::class, 'buyer_id');
    }

namespace App\Filament\App\Resources\Contacts\Pages;

use ...;

class ManageContactBookmarks extends ManageRelatedRecords
{
    protected static string $resource = ContactResource::class;

    protected static string $relationship = 'bookmarks';

    protected static string|BackedEnum|null $navigationIcon = Heroicon::OutlinedBookmark;

    public function form(Schema $schema): Schema
    {
        return BookmarkForm::configure($schema);
    }

    public function table(Table $table): Table
    {
        return BookmarksTable::configure($table)
            ->inverseRelationship('buyer');
    }
}