How to convert whole Google Sheet Watch Changes trigger data into JSON?

Hi. I want to convert all data received by Watch Changes Webhook, convert into json and send through HTTP request.
I’ve tried Aggregate to JSON but it requires to specify data structure. It can differ so I need simply convert object into json. Is there any way to do this?

For example such WHOLE data:

Well I’ve found a solution with Array Aggregator and Transform to JSON but it depends on specified structure. Is there any way to build JSON of ANY structure?

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