How to Implement Interface when using ObservableProperty & RelayCommand attributes?

Hello,

Is there a sample showing how to implement an interface when using ObservableProperty & RelayCommand attributes? How would one implement the ISampleViewModel interface for SampleViewModel?

public partial class SampleViewModel : ObservableObject
{
[ObservableProperty]
ObservableCollection items;

[RelayCommand]
void IncrementCounter()
{
}
}

public interface ISampleViewModel
{
ObservableCollection Items { get; set; }

void IncrementCounterCommand();
}