Layered Lit Mask painting

Unity Engine
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1

I am trying to use the Layered Lit material to texture a building, and instead of using Vertex Paining with Polybrush, I am trying to use the mask texture workflow. But I could not find a way to paint the mask in Editor (I can outside of Editor ofc) but I would like to paint it in the editor. Is there a known workflow? Or do I need to make one myself?

Thanks in advance,

2

There is no built-in tool provided to paint textures on meshes.
Some asset store tools however do it, like :

3

You can use poly brush to paint the vertex color and set the vertex color mode on layered material to add.