@cipimotu I have not seen this functionality in Miro Grids. However, this may be possible with the Miro Developer API.

As an alternative, you could connect Google Drive or OneDrive to your account and then embed a Google Sheet or Excel spreadsheet. Keep in mind there may be administrative blocks in place if you do not manage the Google G Suite Microsoft 365 account that you are trying to connect to.

This is something from a SAFe PI planning perspective that would really go along way with Miro as it is done in Trello.  Adding point values in columns from Jira cards would be greatly useful.