Use field API key in emails

Hi,
I would like to send a pre-filled form with Google Forms and for that purpose, I am trying to figure out if it is possible to use the field API keys of certain fields I need in an email.

Here is what the URL looks like for Google Forms: https://docs.google.com/forms/d/e/1FAIpQLSdz916jSVzcfKg5-ZvvkMgt_i2rrs6B-TqiVf2CNwnyFpGR0g/viewform?entry.202920753=firstname&entry.1769370965=lastname

I am trying to dynamically replace firstname and lastname in the URL.

Please let me know.
Thanks!

Does anybody have any ideas on the syntax I can use? This is all I need to give it a try.
Thanks!

Hi. Did you ever get anywhere with this? I’ve got the same issue. Thanks Brad