Trying to add the value of each incoming label (from GitHub) to a Jira custom field, which is a multi-line text box. Objective is to display one label per line. However the items of the replica.issues array do not appear to implement properties or operators required for string operations: "No signature of method: com.exalate.basic.domain.hubobject.v1.BasicHubCustomField.append() is applicable for argument types: (com.exalate.basic.domain.hubobject.v1.BasicHubLabel)" Whether I iterate the label collection directly (for loop) or use the Groovy .collect() method, the result is the same. A single label instance cannot be directly assigned to a text field, and properties such as 'value' aren't implemented. Given a single label instance from the replica.labels collection, how do I get the label text as a string type?