Grist App change deployement

Hello Grist Team !

I have a deck of document working quite well and I’ve been asked to copy them for another service (cannot be part of the same doc).

Copying the structure without data is well and nice. While working on first app I will certainly to deploy modification to the second app (additionnal fields, new widget ,…).

Is there a way to deploy this change on the second app and on the same time preserving the data already contained ?

Thanks again for Grist.