Task: Gmail important emails' summary to the team chat (Zulip, Slack, etc)

n8n workflow JSON:
{"id":15,"name":"Gmail important to Zulip","nodes":[{"name":"Set","type":"n8n-nodes-base.set","position":[680,300],"parameters":{"values":{"string":[{"name":"=message","value":"=From: {{$json[\"body\"][\"sender\"]}} <{{$json[\"body\"][\"fromAddress\"]}}>\nSubject: {{$json[\"body\"][\"subject\"]}}\nSummary: {{$json[\"body\"][\"summary\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Zulip","type":"n8n-nodes-base.zulip","position":[900,300],"parameters":{"to":["user11@slack.crewnew.com"],"content":"={{$node[\"Set\"].json[\"message\"]}}"},"credentials":{"zulipApi":{"id":"26","name":"Zulip account"}},"typeVersion":1},{"name":"Webhook from Zoho","type":"n8n-nodes-base.webhook","position":[460,300],"webhookId":"fe526767-8414-40d7-b392-52c2e4d0fd53","parameters":{"path":"fe526767-8414-40d7-b392-52c2e4d0fd53","options":{},"httpMethod":"POST","responseCode":"={{200}}"},"typeVersion":1}],"active":true,"settings":{},"connections":{"Set":{"main":[[{"node":"Zulip","type":"main","index":0}]]},"Webhook from Zoho":{"main":[[{"node":"Set","type":"main","index":0}]]}}}