Central control of active lights

Hello, in the last days I configured my Home Assistant and starting to work with it. It’s really amazing how it works. I have one question because I have no idea how to do it. I want to have an overview on my dashboard how many lights are on at the moment. I tried to do that by using a “helper”. I tried to build a helper group “lights” but unfortunatelly not all of the entities are shown there. I just can add some of my different lights but not all. I included Homematic IP devices and Tuya devices for example. Some Homematic “lights” are shown some not. same for the Tuya devices. Could you guys please assist me? Thank you in advance - Markus