JSON.SET

https://redis.io/commands/json.set/
JSON.SET key path value [NX | XX]
Available in: Redis Stack / JSON 1.0.0 Time complexity: O(M+N) when path is evaluated to a single value where M is the size of the original value (if it exists) and N is the size of the new value, O(M+N) when path is evaluated to multiple values where M is the size of the key and N is the size of the new value * the number of original values in the key

Set the JSON value at path in key