Welcome @lauracastro to the Community, thanks for checking us out. According to this document, it appears to not be supported. Please note we do not own the integration so you would need to reach out to Salesforce Pardot for further information.
This should be possible. You can select the fields you want to be included in the comment field by going to:
Admin > Connectors > Pardot > Settings > Lead Capture
and selecting the fields you want to include from the " Add to comment field?" drop-down.