This function returns a text list in result of evaluating text_expression against each of the issues in argument issues.
The parameter textExpression is an expression that returns a text, where references to field values of issues in argument issues are done using the function origin before field code.
e.g., %{function.issue.summary}
is field code for Summary in each of the issues in argument issues.
textOnIssueList(issueList, textExpression) #Output: text list