Show custom entities such as counter

[rossiluis22]

I'm not sure if these is the way to ask new features (sorry if not)
This card currently allows for custom stats to be displayed, such as the lifetime of certain parts of the robot. However, this only works for attributes of the vacuum itself, not separate stat entities. I would like to add my cleaning counter value (entity) to this amazing card :) for Ex.: counter.cleaning_counter

[TheLastProject]

That sounds easy enough to do, similar to #63.

[jandr]

Given that the stats no longer seem as attributes of the Vaccum, but rather sensors, I would very much like this ability to be added!