[feature]: Allow custom field to be rendered on card in overview

Is there an existing issue for this?

• I have searched the existing issues

Summary

We want to add our own custom property to the overview.
Estimate does not have a free number input version. We don't work in iterative steps, but we communicate price directly.

<img width="329" height="148" alt="Image" src=" />

Why should this be worked on?

Great for general overview and clarity for guests.
Small feature with high value.