In Apple Mail, there is functionality to add additional email addresses per email account. In G-Suite (and I would assume Office 365) you can set up email aliases and the additional email addresses in Apple mail associate with those aliases.
My issue is the need for a different email signature to be set by default for each email address, not account.
As you can see here I have multiple email addresses for this one account.
And here you can see that this account has two email signatures, but I can only set one of them for both addresses.
What options do I have to fix this?