How to handle mouse clicks and draw in the actor's viewport?

Development Programming & Scripting C++
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Hi. Maybe someone can help me.
I need to handle mouse clicks and draw in the actor’s viewport. Ideally, this should be done using the on/off button on the top panel.
My task is to select triangles or vertices of a StaticMeshComponent with the mouse and store this information in the default actor object.

I created an editor module and tried:

  1. FComponentVisualizer - it draws in viewport, but everything disappears immediately after pressing compile button and in some other cases. This is not what I want;
  2. Tried FEdMode. It catches clicks in the viewport, but at a level, and I need an actor;
  3. FEditorViewportClient - nothing worked here at all, maybe I don’t know anything.

Is there a suitable class that can be inherited, registered, etc. Or maybe even a video or repository with an example?