We are using 6.3.3 version and intend to upgrade to coral Ui3 as coralUi2 is not supported in 6.5 .
As multifield is stored as JSON in coral UI2 while in coral UI3 we store as node , how can we update (convert json to node) existing data
AEM - Touch UI - Coral2 JSON store to Coral3 node store conversion demo
There is no OOTB tool available to convert JSON to Node structure but you can write a utility to :1. Search components which have multifield property2. convert json to create a node structure.