Feature Request: Entity reference in title

[mitchsurp]

I use bignumber-card a lot, because it serves a great purpose for solar panel displays with BIG numbers. But one thing that's missing is the ability to reference another entity in title.

For example, I have input_text.max_kwh that is the high-water mark for my solar panels. I have another entity written every time this gets updated, input_text.max_date.

In this example, the (June 18, 2022) has to be input by-hand every time this value changes.

I can easily reference one or the other, but I'd like to include {{states.input_text.max_date.state}} into the title field so they both get updated at the same time.

[mitchsurp]

If anyone has the same question, I've replicated this with a vertical stack and card-mod, but it would still be a nice addition to bignumber-card.