URL schemes phone call choose app

I know you can start a phone in Xojo calling a url which with “tel: …”.

Is it possible to show the user a list with all available phone-app’s installed (like Skype, etc.) so he can choose with wathever app the phone call is make. I saw there is a thing called URL schemes, but I have no idea how to implement the api in Xojo.

According to this SO page, it isn’t possible:
https://stackoverflow.com/questions/25926797/ios-how-to-launch-call-applications-like-native-phone-app-skype-lin-phone-etc

Acoording to this entry:

https://stackoverflow.com/questions/43570588/allow-user-to-choose-an-app-to-dial-with-in-swift

there exists a possibility. But i don’t know how to adapt this for Xojo.