Send from Gmail "plus" ([email protected]) address in Mail.app?

I have a gmail account in Mail.app, [email protected].

How can I send mail from Mail.app using the [email protected] From address, instead of the [email protected] From address?

Looking through all Mail preferences and System Preferences > Internet Accounts I don't see how. Probably there's some workaround though.

It's called an email alias.

https://support.apple.com/guide/mail/use-email-aliases-mlhlp1205/13.0/mac/10.15

Create or change an alias

1. In the Mail app on your Mac, choose Mail > Preferences, then click Accounts.
2. Select an account, then click Account Information.
3. Click the Email Address pop-up menu, choose Edit Email Addresses, then do one of the following:
   • Add an alias: Click the Add button +, then enter a name and email address.

Send an email from an alias

1. In the Mail app on your Mac, move the pointer over the From field in a message you’re writing.
2. Click the pop-up menu that appears, then choose an email alias.