Can a Netgate instance on Azure inject BGP routes to internal Virtualnetwork?

[opticalc]

The stock Virtualnetwork Gateway Azure provides leaves a lot to be desired. Would like to instead run a Netgate instance between a public IP and my Azure Virtualnetwork. Then GRE between my on-premises system and use BGP.

But also need to make sure then that the Azure Netgate instance can then BGP peer with something on the inside Virtualnetwork so as to inject the BGP routes into my Virtualnetwork.