Hello @mchojrin,
Using iFrames in emails can be quite problematic. Firstly, many email clients do not support iFrames, and they are commonly associated with scamming or hacking attempts, which can lead to your emails being flagged as spam.
While the iFrame might display correctly in the GrapeJS builder, I strongly advise against using it. Instead, I recommend including a button that redirects to the Google Form link.
Best regards,
Ricardo