Email Routing - forward to SMTP server/s

New to Cloudflare and the Email Routing feature. Am using Email Routing to migrate from G-Suite Legacy.

I want to be able to forward some email address using the existing features, but others I want to forward on to Google’s SMTP servers while G-Suite Legacy accounts continue there.

It doesn’t seem like this is current functionality. Is it being worked on, and likely to be usable prior to Google’s G-suite Legacy end date of 1 June?

Other related threads I’ve found:
CF Email Routing + third-party SMTP server for outgoing mail?
Mail Routing + SMTP

This request is to ask whether CF are likely to support SMTP forwarding as an option in Email Routing.

Otherwise, does anyone have suggestions for similar services?