Email sender setup for "send email" action

My bubble webapp is on starter paid plan.
I’m trying to send emails using the workflow action “send email”.
I specified the sender email and also clicked on specify a different return-to address, and entered the email I want to send as, but then the sender is shown as app_name-no-reply@bubbleapps.io

I got told to insert the sendgrid API in bubble settings and I did it, but then the only email I can use is @brand.com

What if I need to use my gmail account (like —> my_email@gmail.com)? In bubble settings, domain/email section, if my domain is “brand.com” I’m only allowed to use @brand.com emails.

Anybody can help me?