Render only specified objects (similarily to Unity's culling mask)

I’m new to the Unreal world so I would like to ask, if there is a way to render specific objects by some other camera, that is rendered above the main camera. I want the other camera to render for example only a gun (so it is always visible) and all other objects to be rendered by the main camera.

Thanks for all your responses.

No one knows? I have the same question