Google Font API as a default font in MJML Emails

Your software
My Mautic version is: 4.3.1
My PHP version is: 7.4.29
My Database type and version is: 10.6.7-MariaDB-1:10.6.7+maria~bionic

Your problem
My problem is:
I have already implemented an email template with MJML. Sometimes, if by mistake no specific font has been selected for an MJML element, an Ubunto font loaded from Google font api is used for that element. How can i prevent Google fonts from being used , or to prevent from requesting any thing Google-font-api at all?

These errors are showing in the log:

Steps I have tried to fix the problem:
We have try to delete all Tags in custom_html Column in email Table, which hast a request to google font api, but the HTML content is always regenerated, then the link tags with Google-font-api show up again and again.

I am also looking for a way to remove the Ubuntu font that is loaded via the Google Font API from my emails. If this cannot be disabled, it is currently legally impossible to send an email via Mautic in Germany.

Where can I disable the Google Font API or change the default font?