Currently there is no connection between PWS Policies and PRA endpoints. This would be a feature request. PWS integration with PRA/RS is only used for credential injection. All endpoints and Jump shortcuts within PRA follow the jump policies, session policies, and group policy permissions on endpoints.
My apologies! You will only be able to assign jump policies on items that stay listed within the access console. If the PWS External endpoints appear and remain in the console, then yes, you should be able to apply policies to them. However, if they vanish and must be refreshed each time you log in the console, then the policies will not remain.