Hi @RemiBecheru, thanks for the question. Unfortunately, this is not currently possible. The only alternative would be duplicating one of the existing formats, but giving it a different name. But then you would have to implement the conversion logic yourself.
We are considering this as an enhancement for the CoordinateConversion widget. Could you explain why this functionality would be useful for your work/project?
Considering in production the app will be used by people which don't know what DD means for example.
That's why it will be more explanatory to change DD.name with Lat. Long.
Thanks @RemiBecheru, that makes sense. We'll add this enhancement to our roadmap. I'm not sure when this will be come available, but I made a note to update this thread when I have some news to share.