@mentions through API

Hi, 

I have the @mentions notification enabled on my instance and can properly use the mentions on tickets if done manually . 

However we have some automations in place raising tickets from eg monitoring tools. the requirement is to have the @mentions pushed from API also sending an email. 

Now it seems while in auto-suggesting users ServiceNow does some magic to trigger the mentions. as it the journal fields the mentions are only text that does not differ from the text from the API. 

So is anyone able to help me, even with explaining in technical detail the mentions mechanizm? 
how it is pushed from the task tables to the live_notification table?  

Thank You!