.NET MAUI - Dependency Injection - Constructor is never called

I found a way to achieve what I want. For every ViewModel I also create a subclass of PickerBottomSheet now and register it explicitly.

builder.Services.AddTransientPopup();
builder.Services.AddTransientPopup();

public partial class PickerBottomSheet : Popup
{
    public PickerBottomSheet(PickerBottomSheetViewModel vm)
    {
        BindingContext = vm;
        InitializeComponent();
    }
}

public sealed partial class BaitPickerBottomSheet : PickerBottomSheet
{
    public BaitPickerBottomSheet(BaitPickerViewModel vm) : base(vm) { }
}

I'll mark this as answer for now, if anyone has a better way feel free to share :)