Dashboard Tile shows collective state of Dashboard’s devices

I propose allowing a dashboard tile’s state (style and icon) to follow the state of a variable. Use case: the color/icon of a Lights dashboard tile can follow the state of an “anyLightOn” variable. For example, if any light is on, the Lights dashboard tile can be yellow, to show that there is at least one light on.

This functionality can be done now using a Variables tile, with a link to the URL of the target dashboard. So this request is to be able to have this functionality with an actual dashboard tile.

See this related feature request as well, for the reason why the variables tile might be insufficient.