It's only available in managed instances or on-prem. We are trying to use the "serverless" flavor of Azure SQL throughout:

https://learn.microsoft.com/en-us/azure/azure-sql/database/f...

I don’t know the OPs answer, but I’d hazard to guess because ssmb is a completely neglected feature with very little in the way of community or UI. In theory it would be great, but MS basically never invested in it after its release and now it’s just a random, “who knows when we’ll drop support for this” sql server feature.