TDX 1.5 in Confidential Compute VMs

In Verify a Confidential VM instance's firmware  |  Google Cloud the TDX instructions reference “TDX Module 1.5”, but however I am unable to get TDX 1.5 quotes from my confidential VMs. Are there any places I can provision a TDX 1.5 VM on Compute Engine?

I’m using c3-standard-4 VMs right now.