Body example
customfield_10900 is a single select list
customfield_10600 is a text field to store the issue key in
{ "fields": { "project": { "id": "10100" }, "summary": "{{issue.summary}}", "issuetype": { "id": "10001" }, "priority":{ "name":"{{BC_PRIO}}" }, "labels": [ "from_testsup" ], "description": "{{issue.description}}", "customfield_10600": "{{issue.customfield_10703}}", "customfield_10201": "{{issue.key}}", "customfield_10900":{ "value": "{{issue.customfield_10800}}"} } }