How to achieve CCR for more than 20 indices at once without snapshot

Hello,

I have multiple indices already created in cluster A and I want them to be replicated to cluster B , is there a way to create those many follower indices without manual effort as it will increase operational load and snapshot might not help as these indices keep on getting new updates. Kindly request you to help.

Note : if I use kibana console or curl it would take a lot of time to replicate one by one and auto follow pattern was not enabled before. I am new to elastic search