HMIP-WRC2: Do something as long as button is pressed

Hey everyone,
I’m using a Shelly Dimmer to control my bathroom lights. I’ve put a HMIP-WRC2 on top of it (the battery one because there’s no room left behind the switch or else the Shelly wouldn’t fit), so it’s not connected to the Shelly as a switch.

Now, I want to configure the HMIP-WRC2 button to lower the light as long as the down (ch1) is pressed. However, I just can’t find a way in Home Assistant for an automation to execute a light dimming “as long as a button is pressed” because in Home Assistant, the HMIP buttons are no “buttons” but “events”.

Can anyone help me with my configuration here?

Thanks a lot in advance.