Fastmail Masked Email feature request

Hello 1Password Team - Could you please add the ability to specify a custom prefix when creating a masked email address in Fastmail?  Their API supports it.

I like to use prefixes on my aliases since it helps group the type of sender or service (financial, shopping, apps, etc.) to have rules that can label, archive, forward, etc. and would love to specify a prefix during masked email creation. This could alleviate the alternative of using catch all aliases.

It would also be a big time saver if you could add creating the masked email addresses to the iOS app.

Thank you!