Log into your server (master in case of a cluster)
elevate to root user
execute:
psql cb -p 5002 -c "COPY (select name, search_query from watchlist_entries where group_id=-1 order by id) TO '/tmp/watchlist_entries.csv' with CSV HEADER;"
CSV file will be located under /tmp/watchlist_entries.csv
Option 2:
Export via API: https://community.carbonblack.com/t5/Knowledge-Base/EDR-How-to-export-and-import-Watchlists-between-Server-Cluster/ta-p/81071
Additional Information
The watchlist query from option 1 will be in URL encoded format. It will need to be URL decoded to be human readable.