I see a MongoDB service in Microsoft Azure but that deploys a VM and installs MongoDB in that. I am guessing this will not auto scale and also charge me for the entire VM and MongoDB management (not just for my usage).

Is there any managed MongoDB as a service available in Microsoft Azure which will:

a) Auto scale.
b) Charge me only for my usage.

I see MongoDB container image by Bitnami but I might have to deploy this on Helm.

What are my options here?