Area Target Interactions

Hi everyone! I've created an Area Target by using the Area Target Generator software importing a Matterport Scan. Then, I created an application in Unity and everything seems to work fine. However, I'm trying to understand how to create interactions inside my Area Target in Unity.

Example: I've put a virtual object (obj file), a chair in my space and I would like to be able to click on this chair and change its color. I know how to create virutal buttons with image targets, but have no ideia how to deal with interactions in Area Targets.

Appreciate any help!

Pablo