--append

For field value and custom field actions, this must be single field name or id. For issue related actions, the parameter can be specified multiple times for setting custom field values as a more convenient alternative to the custom parameter. Additionally for custom fields, JSON can be used. See the documentation for more details on this advanced use case. The following common client field parameter support applies. For some actions using the file parameter, append will append output to the existing file.

append

boolean