How to retrieve the UUID of the building model onclick?

I have 3D building models, being loaded via JSON with gltf format. I would like to retrieve the individual model’s uuid when the user clicks on the building.How can I do it on cesium platform?

Example of UUID : _bck_blk400b_BD.X7jqjezPgOHx7jdsaXYw8.

I do not want 3d Tiles. So do I use primitives? if so, how do I call it to get the UUID?

Or is there a way to get the UUID by using the coordinates?

Is this UUID defined inside the glTF? If so, how are you defining? In general you can use viewer.scene.pick to pick any primitive in the scene.