Task: Analyze feedback using AWS Comprehend and send it to a Mattermost channel

n8n workflow JSON:
{"nodes":[{"name":"Mattermost","type":"n8n-nodes-base.mattermost","position":[810,300],"parameters":{"message":"=You got new feedback with a score of {{$json[\"SentimentScore\"][\"Negative\"]}}. Here is what it says:{{$node[\"Typeform Trigger\"].json[\"What did you think about the event?\"]}}","channelId":"h7cxrd1cefr13x689enzyw7xhc","attachments":[],"otherOptions":{}},"credentials":{"mattermostApi":"Mattermost Credentials"},"typeVersion":1},{"name":"NoOp","type":"n8n-nodes-base.noOp","position":[800,500],"parameters":{},"typeVersion":1},{"name":"IF","type":"n8n-nodes-base.if","position":[600,400],"parameters":{"conditions":{"number":[],"string":[{"value1":"={{$json[\"Sentiment\"]}}","value2":"NEGATIVE"}]}},"typeVersion":1},{"name":"AWS Comprehend","type":"n8n-nodes-base.awsComprehend","position":[400,400],"parameters":{"text":"={{$json[\"What did you think about the event?\"]}}","operation":"detectSentiment"},"credentials":{"aws":"AWS Comprehend Credentials"},"typeVersion":1},{"name":"Typeform Trigger","type":"n8n-nodes-base.typeformTrigger","position":[200,400],"webhookId":"ad8a87ef-d293-4e48-8d36-838d69ebce0f","parameters":{"formId":"DuJHEGW5"},"credentials":{"typeformApi":"typeform"},"typeVersion":1}],"connections":{"IF":{"main":[[{"node":"Mattermost","type":"main","index":0}],[{"node":"NoOp","type":"main","index":0}]]},"AWS Comprehend":{"main":[[{"node":"IF","type":"main","index":0}]]},"Typeform Trigger":{"main":[[{"node":"AWS Comprehend","type":"main","index":0}]]}}}