It would be really helpful to be able to use a variable to set a Type Style’s Letter Case (under the Type Settings meatball menu).
It could be a String Variable, and the options would be “As entered”, “Uppercase”, “Lowercase”, “Title case”, and “Small caps”.
I personally use modes to switch between different brands, and some brand styles require uppercase while others don’t allow it. This suggestion may be a small feature in the grand scheme, but I wonder if others would also find it useful.
+1 here - absolutely necessary for a true multi-brand type system with variables
+1 for this, we run multiple brand designs system and this feature not being available is preventing us from fully rolling out.
+1 here too - we are approaching twenty brands and this feels like the missing jigsaw piece - it is very time consuming managing styles like this via content string names or overrides.
+1 really needed for a multibrand ds!
+1 for this, really needed for a multibrand.
+1 really needed for multibrand!
+1 this is a necessity
+1 I also would like this to be handled properly.
I did figure out a farily elegant workaround to unblock this issue for our multibrand design system needs where only one of the brands use all caps for button labels. Here is an outline of the steps.
Use boolean Figma variables to represent text case design token decisions across modes. Publish the update if you are managing these in a seperate library file.
button/textCase/uppercase variable, and the as typed styled text to the button/textCase/none variable 
Now when I switch modes on a container with that component, the correct text layer is displayed including the correct text case style for that brand
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