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If I understand correctly - that you want the output you specified to be your response body, you can use the

regexExtract

and

jsonPath

helpers e.g.

{{#trim}}
{{regexExtract (jsonPath request.body '$.id') '(.+)_(.+)' 'parts'}}
{
    "payload": {
    	 "cluster": "{{parts.1}}",
    }
}
{{/trim}}

Hi Tom , You are great . Thanks for support ! I spent a day to find it . You solved the problem . Thanks

Hi @Tom , I am also looking for the same solution but in my case the ID is a header so how to pass that header value to regexExtract ?