Just drag from the cast node blue output pin and select Promote to variable. This will create the correct variable type automatically.
Some additional logic to change color and text of the specific blueprint instance, you can see in the video I shared here:
- In editor it says “Text” and it’s grey, the default color.
- When in Play it says “Level Incomplete” in yellow.
- When completed it changes to “Level Complete” and green.
I could share it later but it’s not relevant to what you are trying to achieve. Was done just for debug / demo purposes.