Canvis a "Proposal + comments export"

Is your feature request related to a problem? Please describe.
As a participatory space admin and with proposal component active, I want to export proposals + comments in one single actions, not having to export them in two actions and having as a result two different documents.

Describe the solution you'd like
From admin panel, proposal component, I would like to have the button \"export all > proposals + comments\" as a CSV, JSON and Excel.

Describe alternatives you've considered
-

Additional context
-

Does this issue could impact on users private data?
-

Funded by
-