Any luck on this?

I am also looking for the options on AWS S3 interactions via Boto3 by using Databricks Serverless Notebooks (Compute).

When I tried the new feature (Instance Profiles with Serverless), DBUTIL functions work great on Notebooks, but not the Boto3. We can use Spark read functions, but they are not meant for every operation we perform on S3.

I will definitely try both: creating a Boto3 client using access/secret keys, and then the Service Credentials approach. Before that, I would like to see if these options worked for anybody.