Hi @MarioFerreira,
I believe this is a gap in the API. Version 3 of the REST API returns the columns widths, but this is in Atlassian Document Format (ADF) and we don’t provide an adequate spec or libraries to help with the parsing so I don’t think this is a viable alternative for you.
I have created JRACLOUD-76063 to cover this.
Regards,
Dugald