There is no feature to bulk edit the "Request Participants" of a JIRA Service Desk Issue. Instead, when users attempt to edit the field using Bulk Edit, they experience an error stating "Bulk editing is not supported for Service Desk Request participants.". When users need to change the "Request participants" of multiple issues, they need to do it manually one by one.
- Search for some Service Desk Issues
- Attempt to use the Bulk Edit > Edit feature
- Observe that there is no way to update the "Request Participants" as it is listed as an "Unavailable Action"
The ability to update the "Request Participants" field should be possible.
No such functionality exists in the product.
A possible workaround could be to use the REST API