I am using Openrowset with OpenJson to query files in a data lake using a Synapse SQL Serverless database.
I have found the filename() and filepath() file metadata functions. https://learn.microsoft.com/en-us/azure/synapse-analytics/sql/query-specific-files#filepath
Are there more functions or is that it? I would really like to be able to get the file modified timestamp.
File metadata features are not supported via serverless function.
You should use Synapse spark notebook to query the blob metadata instead. You can find more information at BlobProperties Class