[Question] Defining Text Overrides on a SymbolInstance
Is it possible to define text overrides for a symbol instance?

If I've grabbed an instance from a `Map` as shown [here](https://github.com/html-sketchapp/html-sketchapp/wiki/Usage-Examples#create-and-use-instance-of-a-symbol). If my symbol has a `Text` layer that can be overridden, is there a way to define what text goes inside that instance instead of having to manually update all instances in Sketch?