Is there a way to make DDNS update per-WAN interface while using failover gateway Multi-WAN for high-availability?

My goal is to ultimately have 3 DNS records...
-One that tracks the HA current in use gateway
-One that is locked to WAN1
-One that is locked to WAN2
Both WAN1 and WAN2 are dynamic from my ISPs.

I'm using Namecheap and added in new records

wan1.name.example.com
wan2.name.example.com

and set up the DDNS clients in pfSense that I expected would update them...but it shows them both as the primary-WAN1 IP address:

And that is verified by what it pushes up to Namechap:

Nomater what I pick, it's under WAN1 IP that it pushes, which I assume is related to my having everything use the WAN failover to get to the Internet?