Manipulate only certain part of GDI text

I am wondering how to recreate what StreamLabs does for Alerts. Specifically how to manipulate variables by changing colour or animate them.
For example like they have only affected the username in this screenshot for a Follow notification.

I can create 2 GDI text sources of course, but how do I make the second one aware of how long the username is etc? I'm just rambling.. no idea where to start
 

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