Mark cards as signed

As of today, cards can be tagged and commented with notes.

There is no way to mark them as signed, which may for some be a huge gap in price.

For instance, I own a (MTG) CE’s Shivan Dragon signed by the artist.

Card value without signature is around 60/70€, but signed it’s worth somewhere close 200€ (sold 200$ by the artist until 2018).

Marking its value in the comment does reflect in inventory’s value. I own like 50 signed cards procuding a huge gap