Welcome to the Make community!
Yes, that is possible. You’ll need a minimum of four modules:
0. Set Webhook to Pass-through
You can do that by setting the Webhook “JSON Pass-through” to YES (it is “No” by default), when creating or editing a webhook.
Then, you will be able to map the entire JSON body payload in another module.
1. Match pattern in your webhook JSON
Use a Text Parser “Match Pattern” module with this regular expression pattern
"(?<key>[^"]+)_(?<number>\d)": "?(?<value>[^"]+)(?:"|,)+\s
Regex test: https://regex101.com/r/34Y18M
Important Info
Global match must be set to YES!
2. Aggregate to Text #1 with "key":"value", group by item number
3. Aggregate to Text #2 with {} object wrapper
4. Parse JSON with array wrapper
You can copy this so you don’t have to type it out, insert variable between square brackets
{"items":[ ]}
Output
Give it a go and let us know if you have any issues!