Yes, MHO does not have API support as of now.
My question is for spesifically for 40k/60k chassis gateways actually. We have one of them in our environment. Can I use GAIA API on 40k/60k chassis gateways the same way that I used in Security Gateways (like 16k,28k)?
From your above answer I deducted that I can use GAIA API with using security group's IP address which defined MHO switch and can achive creating new vlan interface automation successfully. If it is true then I can use it with 40k/60k chassis gateway with the same way that I used in MHO's security group's IP address as I understand correctly.