ScriptRunner. How to addCustomFieldValue() for IssuePicker with multiple values? What value is expec

[Daniel]

I want to update a Issuepicker in a listener.

On this page:
https://scriptrunner.adaptavist.com/latest/jira/script-fields/issue-picker.html
its say do it like this:

issueInputParameters.addCustomFieldValue(fieldId, "MSD-5")

This works for one issue to add.
But how to add multiple issues?

In the docs of IssueInputParameters its saying:
>> values - the custom field values, must be in the format the field expects.

BUT WHAT IS EXPECTED FOR AN ISSUE PICKER? Can somebody help?

I want to input a variabel but testet first with static strings.
What doesn't work is:

.addCustomFieldValue(fieldId, ["MSD-5", "MSD-6"])  // of course its not a string

or

.addCustomFieldValue(fieldId, "'MSD-5', 'MSD-6'")

[Viktor Galunov]

String[] issues = ["MSD-5", "MSD-6"]

.addCustomFieldValue(fieldId,issues)