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anyone knows how to do something like this ?

The target needs to be an existing element. It looks like you've set the id of your new field to be the target as well, like you're trying to add your new field to itself. If you want to add a new field for the cases subtab, you can do that without using JSONPath

You only need to use the modifications property if you're changing an existing property, and I don't think we have an existing property for what you're targeting

Thats right! I just added the new props on the json file without the sub info, etc