@eg1995 Thank you for reaching out to Microsoft Q&A. I understand that you want to setup connectivity between your on-premise and your secondary vnet-2. Since you already have a connection from vnet-1 to your on-premise, you will be able to utilize this connection and setup connectivity between vnet-2 and on-premise via Gateway Transit as you mentioned (Vnet-1 will act as Hub and Vnet-2 will be the Spoke). You do not need any additional connections or setup for this.
Here are more details Gateway Transit given in this document- Configure VPN gateway transit for virtual network peering Hope this helps.
Please let us know if you have any further questions and we will be glad to assist you further. Thank you!
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