For Self-hosted clients, We just need to deploy our newer version at the client's server. Rest, you just have to add new fields as mentioned in the Migration Document at your end as per your need.
For cloud-hosted, You just need to map the new fields as per your requirement and rest everything remains the same for you.
If you still have any questions, you can always contact RChilli Support via creating a ticket at RChilli Helpdesk or simply by sending an email at email@example.com. The support team assists you further on this and for deployment as well.