Add a list of issue as dynamic field in Request creation via customer portal

Hello,

We are trying to give the possibility to the customers, when creating a ticket from the customer portal, of selecting an issue (could also be just plain text of the issue key) from a dropdown field based on a dynamic list, filtered for example by request type and if the issue hasn't already a linked issue. is this something viable with JSM? We are trying to do this because we cannot display and let the customer choose the linked issue field.

Thanks,

Giulio