I don't think its possible to visualize Mongo data out of the box due to the fact its schemaless. They have this product https://docs.mongodb.com/bi-connector/master/ which I have not used but it looks something that would be able to solve the issue? I have tried also Metabase with Mongo and it works to some extent but when I tried the queries didn't work etc.

I think your best option would be to custom build some dashboards using some HTML and JS and some API that serialializes your data or if you need BI tool then either check out their bi-connector or maybe build some ETL workflow and save your data in Bigquery or something similar. From there it would be easy to use Metabase or something else to visualize your data.