Action to link a custom entity/sensor to an existing device (listed as a entity in a device's card.)

[stovedoctor]

Feature Request: Action to link a custom entity/sensor to an existing device (homeassistant.add_entity_to_device)
Message: Hey Frenck, loving Spook and after years of using spook I finally had the time to read the new docs. Love it and have learned so much and all the crazy tools it adds to the system and thank you for writing in non geek speak!

I had an idea for a new action that I think would be super useful for those of us with heavily customized setups.
Right now, the HA UI lets you link a Template Helper to a device when you first create it. {Listed in a device's card} But there is no native service to link a YAML template sensor (or any other custom/external sensor) to an existing physical device after the fact. I'd love to be able to group these custom sensors neatly onto the same Device page and device cards.
Since you already built actions to dynamically link things to areas (like homeassistant.add_entity_to_area), do you think it would be possible to add something like homeassistant.add_entity_to_device?
Being able to programmatically link custom YAML sensors directly to existing hardware devices on the fly would be a massive organizational win.
Thanks for all the hard work on this integration!
Miss your live streams. Chu Chu .....😎