amkp
Sorry, what is "hook"?
The json data looks correctlty.
Habitually, basic json format is like { "mykey" : "myvalue" } not { "mykey" : ["myvalue"] } no ?
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Insert "myValue" into array at "myKey"[0]
"myKey"[0] --> Index 0 at Array "myKey". i.e. "myKey" is an array.
Try to use "Action:Set value" to "set value by key"
It's ok, I understand my mistake, sorry.