How can I secure the search results in Assigned Journeys to only one checklist template journey?

I am working on a requirement for a user to login and search for employees with a specific journey assigned. For this example, I will use the "Vaccine" journey.

Use case: The user needs to login and search for employees in the "Assigned" journeys tab when navigating to My Client Groups > Journeys. When completing the search, only the journey associated with the Vaccine checklist template should appear. If the user searches for Employee A, who has 4 journeys assigned to them, the only search result that should return is the Vaccine journey.

Configured role is set up in the "Checklist Template" setup and maintenance task for the Vaccine journey as outlined in https://docs.oracle.com/en/cloud/saas/human-resources/24b/faijh/secure-assigned-journey-by-template.html#u30236801 and https://docs.oracle.com/en/cloud/saas/human-resources/24b/faijh/how-you-secure-assigned-journeys-based-on-specific-templates.html#u30236799. The issue is restricting the search result in assigned journeys, not the actions that can be performed on the journey.