With the following solution, we can switch the Ownership of a record or rather of records, bellow a folder:

record-permission --action=grant --can-share --share-folder --recursive FOLDERNAME

If that doesn't work, please create an Excel-file an change it manually per record:

1. Create Excel file:
share-report -o --format=csv --output=output.csv

The file is saved here:

2. Filter the Excel and run the following commands on the Keeper commander:

share-record RECORDID -a owner -e NEWOWER

Example: