Hi @Rotzend and welcome to the forum. Here are some useful links, ask again if you still have issues and remember linking to a playground with your code helps us help you .
https://doc.babylonjs.com/how_to/dynamictexture#text-and-area-matching
Feel free to experiment with any of the playgrounds in the solutions of the above topics, you cannot overwrite any existing playground. Saving your experiments will just produce a new playground.