I added that functionality to lawnchair for my new qin rom, I will share it soon. You can also use key mapper - i used it with nova for a long time. Use this keymap (import to keymapper).
Press any number key to dial, including # and *. Longpress 1 for voicemail (Verizon - *86) longpress * to dial +, longpress # to toggle vibrate/silent/normal ringer mode.
key_maps_20260515-121940.zip (2.2 KB)
I have a constraint set to only trigger on nova launcher home screen - you should change this to quickstep or lawnchair, depending on what you use.