How to get Input Action CallBack in MRTK3?

[SangonomiyaSakunovi]

Describe the issue

I want to use Azure Spatial Anchors or World Locking Tools or other modules, but the question is: How to get the Input by MRTK3?Please tell me how to do? Or can you let me know in which repo has some reference?

Feature area

In this document, there is nothing mentioned about how to add a call back. I know that in the XR Controller Script has some Action can reference, but that seems not the pos where I can add my Action.

Existing doc link

If this is about something in an existing document, please provide link

Additional context

Add any other context about the problem here.

[AMollis]

@SangonomiyaSakunovi moving to our Q&A discussion