In the server/computer where you need to run CouchDB, which seems to be in your Cloudways server, you must execute the following command:
ssh -N -L SOURCE_PORT:localhost:5984 -i /path/to/SSH_KEYFILE bitnami@COUCHDB_IP
If you decide to use 5984 for source port, then in your Cloudways machine, you would connect to CouchDB via http://localhost:5984.
IMPORTANT: We highly recommend you to close your Cloudways machine's port 5984 to the outside. If not, at least choose a different source port.