Add different icons for estimate fields on feature cards

What is the challenge?

We use several different estimate fields on our feature cards (initial, detailed, time remaining). Currently there are 5 different fields available for the feature cards that all use the same icon. It is difficult to read the card and understand which estimate field is which.

What is the impact?

confusion and cluttered cards

Describe your idea

Can we either have different icons for each of the estimate fields, or have a way to add a label. Either provided by Aha! or a free-form text box that we can add to label various fields?