Searching for File Protocol Links (file://) in SharePoint 2013

We are getting ready to migrate our on-premise SharePoint 2013 to SharePoint online.  File protocol links like file://<servername>/<directory>/<filename> will not work after the migration.

https://techcommunity.microsoft.com/t5/sharepoint/file-protocol-links-in-sharepoint-online/m-p/3266860

Is there a way to find or list up (like by SharePoint Management Shell) all the file protocol links?

We plan to copy the target files to SharePoint online and fix the links prior to migration.

Surprisingly, SharePoint Migration Assessment Tool (SMAT) did not scan or report that file protocol links will not work after migration.