Task: Sync Zendesk tickets with subsequent comments to Jira issues

n8n workflow JSON:
{"meta":{"instanceId":"237600ca44303ce91fa31ee72babcdc8493f55ee2c0e8aa2b78b3b4ce6f70bd9"},"nodes":[{"id":"b374f136-0050-40ea-b889-03c1e20a161e","name":"IF","type":"n8n-nodes-base.if","position":[1000,300],"parameters":{"conditions":{"string":[{"value1":"={{$node[\"Determine\"].json[\"Jira issue key\"]}}","operation":"isNotEmpty"}]}},"typeVersion":1},{"id":"52e85300-9a2f-45e9-973e-0fda49a50bf1","name":"Create issue","type":"n8n-nodes-base.jira","position":[1180,400],"parameters":{"project":"10000","summary":"={{$node[\"Get ticket\"].json[\"subject\"]}}","issueType":"10003","additionalFields":{"description":"=See Zendesk issue at: https://n8n.zendesk.com/agent/tickets/{{$node[\"Get ticket\"].json[\"id\"]}}"}},"credentials":{"jiraSoftwareCloudApi":{"id":"23","name":"[UPDATE ME]"}},"typeVersion":1},{"id":"85c93002-95d3-434d-b9e9-10ef714432b1","name":"Update ticket","type":"n8n-nodes-base.zendesk","notes":"Update the Zendesk ticket by adding the Jira issue key to the \"Jira Issue Key\" field.","position":[1360,400],"parameters":{"id":"={{$node[\"On new Zendesk ticket\"].json[\"body\"][\"id\"]}}","operation":"update","updateFields":{"customFieldsUi":{"customFieldsValues":[{"id":6689934837021,"value":"={{$node[\"Create issue\"].json[\"key\"]}}"}]}}},"credentials":{"zendeskApi":{"id":"24","name":"[UPDATE ME]"}},"notesInFlow":true,"typeVersion":1},{"id":"3aa0dff6-f4a5-47c1-9843-271b78bfbf36","name":"Get ticket","type":"n8n-nodes-base.zendesk","position":[640,300],"parameters":{"id":"={{$node[\"On new Zendesk ticket\"].json[\"body\"][\"id\"]}}","operation":"get"},"credentials":{"zendeskApi":{"id":"24","name":"[UPDATE ME]"}},"typeVersion":1},{"id":"efd1f838-226f-4869-83f8-086d31f8a9bc","name":"Determine","type":"n8n-nodes-base.function","notes":"if issue was created already in Jira","position":[820,300],"parameters":{"functionCode":"/* configure here =========================================================== */\n/*  Zendesk field ID which represents the \"Jira Issue Key\" field.\n*/\nconst ISSUE_KEY_FIELD_ID = 6689934837021;\n\n/* ========================================================================== */\nnew_items = [];\n\nfor (item of $items(\"Get ticket\")) {\n    \n    // instantiate a new variable for status\n    var custom_fields = item.json[\"custom_fields\"];\n    var jira_issue_key = \"\";\n    for (var i = 0; i < custom_fields.length; i++) {\n        if (custom_fields[i].id == ISSUE_KEY_FIELD_ID) {\n            jira_issue_key = custom_fields[i].value;\n            break;\n        }\n    }\n\n    // push the new item to the new_items array\n    new_items.push({\n        \"Jira issue key\": jira_issue_key\n    });\n}\n\nreturn new_items;"},"notesInFlow":true,"typeVersion":1},{"id":"41a1c04b-561b-41e3-be6e-fc953319abc1","name":"Create comment to existing issue","type":"n8n-nodes-base.jira","position":[1180,200],"parameters":{"comment":"={{$node[\"On new Zendesk ticket\"].json[\"body\"][\"comment\"]}}","options":{},"issueKey":"={{$node[\"Determine\"].json[\"Jira issue key\"]}}","resource":"issueComment"},"credentials":{"jiraSoftwareCloudApi":{"id":"23","name":"[UPDATE ME]"}},"typeVersion":1},{"id":"33e0121e-703d-4c60-b257-a89a99db771a","name":"On new Zendesk ticket","type":"n8n-nodes-base.webhook","position":[460,300],"webhookId":"d596c0c6-7377-4a17-9ed5-6ee953f072b9","parameters":{"path":"d596c0c6-7377-4a17-9ed5-6ee953f072b9","options":{},"httpMethod":"POST"},"typeVersion":1}],"connections":{"IF":{"main":[[{"node":"Create comment to existing issue","type":"main","index":0}],[{"node":"Create issue","type":"main","index":0}]]},"Determine":{"main":[[{"node":"IF","type":"main","index":0}]]},"Get ticket":{"main":[[{"node":"Determine","type":"main","index":0}]]},"Create issue":{"main":[[{"node":"Update ticket","type":"main","index":0}]]},"On new Zendesk ticket":{"main":[[{"node":"Get ticket","type":"main","index":0}]]}}}