How can I add a custom mesh(let's say Cube) in the exact same position as of a particular object in a GLTF model?

I have a room GLTF model. Now I want to add my own object in the position of the chair (present in room model).

If the chair has a name, you can search for this in the scene. Once you have the object, you can create the cube by copying the objects position.

@anidivr It’s not working as expected if i just copy the position of the chair to the object.
When I animate that object further it starts from origin (0,0,0)

My guess is the chairs position is is relative to the parent at (0,0,0). You probably need to get world position of the chair and using that vector3