Please help a newbie

Please help, I'm still a beginner and trying to figure this out.

Is it possible to use Gaussian Splatting to get a good 3D model and then apply various marks?

For example, when building a house, to mark a specific area.

I tried using Brush, then exporting it to Blender and trying to extract the model there, but nothing worked.

So far, the classic WEBODM works better for this case, but it is already a fairly old technology and I see great potential in GS

For now i'm using Colmap + Brush, and then Meshlab.

Specifically, it is important for me to be able to apply various markers, marks, and other things.

Thanks!