Notifications for Gigs

Am I understanding correctly that the following notifications are the only ones that are currently delivered for gigs? We cannot add custom notifications?

Scenario	Notification Sent	Notification Description
A gig is assigned to an employee. If the approval flow is enabled, the seeker's manager receives an approval request.	ORA_OM_GIG_ASSIGNED	Notification sent to a gig seeker's manager requesting their approval to allow the gig seeker to accept the gig assignment.
A gig that a user was assigned to is canceled by the gig creator.	ORA_OM_GIG_CANCELED	Notification sent when a gig is canceled.
A gig seeker's manager rejects the gig assignment.