Task: Gmail to G Sheet test

n8n workflow JSON:
{"id":"4","name":"greeting","nodes":[{"name":"Webhook","type":"n8n-nodes-base.webhook","position":[720,410],"parameters":{"path":"greetinghook"},"typeVersion":1},{"name":"HTTP Request","type":"n8n-nodes-base.httpRequest","position":[1120,410],"parameters":{"url":"https://webhook.site/c0a47a6f-6a71-4d18-baef-51f694f7c56b","requestMethod":"POST","responseFormat":"string","bodyParametersUi":{"parameter":[{"name":"greeting","value":"={{$node[\"FunctionItem\"].data[\"greeting\"]}}"}]}},"typeVersion":1},{"name":"FunctionItem","type":"n8n-nodes-base.functionItem","position":[930,410],"parameters":{"functionCode":"item.greeting = `Hello ${item.query.name}, have fun at the ${item.query.event}!`;\nitem.greeting = \"Hello \" + item.query.name + \", have fun at the \" + item.query.event + \"!\";\nreturn item;"},"typeVersion":1}],"active":false,"settings":{},"connections":{"Webhook":{"main":[[{"node":"FunctionItem","type":"main","index":0}]]},"FunctionItem":{"main":[[{"node":"HTTP Request","type":"main","index":0}]]}}}