Support for Home Assistant (MDI) icons in template widgets

**Is your feature request related to a problem? Please describe.**
I would like to have a compact widget on my homescreen, with as much information as possible. Now, I "lose" quite some real estate because of text (labels).

**Describe the solution you'd like**
I feel it might be nice if we could include icons in the home screen widget, e.g. using ``.

**Describe alternatives you've considered, if any**
A larger widget - eventually, the screen size of the phone is finite :-).

**Additional context**