Fill custom field with jira-steps-plugin in jenkins fails with “Could not find valid 'id' or 'value' in the Parent Option object.”

[Adrian Wyssmann]

I configured a custom field pkg in Jira of type Select List (single choice)

<https://i.stack.imgur.com/UpXkB.png>

I would like to create an issue as follows using the jira-steps-plugin 
<https://jenkinsci.github.io/jira-steps-plugin> and filing the custom field 
with a given text, not the id of the entry, so something like this
String pkg = "Maven" customfield_15207: value: pkg, 

More context
newJiraIssue = [fields:
                [ project:
                    [key: jiraProjectKey],
                    summary: issueTitle,
                    description: summary,
                    customfield_15207: pkg,
                    issuetype: [name: jiraIssueType]
                ]]

withEnv(["JIRA_SITE=${jiraSite}"]) {
    try {
        String response = jiraNewIssue issue: jiraIssue
        jiraIssueKey = response.data.key
        println "[INFO] ### issue created: ${jiraIssueKey} "
        if (isDebug) {
            echo response.data.toString()
        }
    } catch (Exception e) {
        println("[ERROR] Error creating jira Issue\n${e.getMessage()}")
        throw e
    }
}

Unfortunately this fails with
Error Code: 400 Error Message: 
{"errorMessages":[],"errors":{"customfield_15207":"Could not find valid 
'id' or 'value' in the Parent Option object."}} 

Other options I've tried, with the same outcome
String pkg = "Maven" customfield_15207: [ value: pkg ], 

and
String pkg = "Maven" customfield_15207: [[ value: pkg ]], 

and
String pkg = "Maven" customfield_15207: [ name: pkg ], 

How can I achieve this? what do I miss?

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