Workflow: automate with n8n workflow for Manual Mongodb Automate Triggered
Integrations: manualTrigger, mongoDb, set

{"nodes": [{"name": "On clicking 'execute'", "type": "n8n-nodes-base.manualTrigger", "position": [220, 320], "parameters": {}, "typeVersion": 1}, {"name": "Set", "type": "n8n-nodes-base.set", "position": [420, 320], "parameters": {"values": {"string": [{"name": "my_key", "value": "my_value"}]}, "options": {}}, "typeVersion": 1}, {"name": "MongoDB", "type": "n8n-nodes-base.mongoDb", "position": [620, 320], "parameters": {"fields": "my_key", "operation": "insert", "collection": "n8n-collection"}, "credentials": {"mongoDb": "mongodb_credentials"}, "typeVersion": 1}], "connections": {"Set": {"main": [[{"node": "MongoDB", "type": "main", "index": 0}]]}, "On clicking 'execute'": {"main": [[{"node": "Set", "type": "main", "index": 0}]]}}}