When Friendly Name is not enough to describe an entity it would be good to have a ‘description’ attribute which is made visible to the user when they hover over the name of the entity in Lovelace. For example when I hold the mouse over Target Temperature it could have a pop up that says ‘Sets the target temperature of the Nest thermostat in degrees, will only be taken into account when not in ECO mode’.
I really want something like this to document my HA extensions without the users having to read the manual for each switch/number setting