Async "CanExecute" for RelayCommand

[jonmotos]

How would I use an async function to update a "CanExecute" property of a RelayCommand?

The docs say a method can be used, but unfortunately an async Task method gives a build error of
"The CanExecute name must refer to a compatible member, but no valid members were found for "CanUpdate" in type foo"
Changing that to either a property of the same name, or a non-async method works fine, of course!

I also assume this is sort of a smelly bit of functionality, but on first blush it seems like a legit need?
If I simply made the property initiate a Task that is not awaited, but then updates a backing field and then calls CanExecuteChanged... well, that's circular!

Any thoughts or ideas?
@Sergio0694 it seems like perhaps the RelayCommand CanExecute could support async methods?