In Legacy Automations I was able to mention coworkers as part of an internal comment when a ticket is at risk of breaching SLA or needs attention:

However, in JIRA Automations I can set an internal message, but there doesn't seem to be any option to tag system users within it, and the only notification options are for external feeds such as email or slack:
Can anyone point me in the direction of how to tag colleagues into tickets and notify them within the platform, please?
Many thanks.