Hi Have you tried using MongoDB Atlas for your Mongo database? It's an on-demand, fully managed database service that you can provision on Azure, AWS, or GCP (so no lock in to any 1 cloud provider) https://www.mongodb.com/cloud/atlas

It includes a free tier for experimentation and evaluation (currently only available on AWS)

And as this is real MongoDB, rather than a Cosmos shim of the APIs, all the features of MongoDB actually work....

Disclosure: I work at MongoDB