[Feature Request] Allow math to interpret content within {} as subscripts or superscripts

[NoahStoryM]

Is your feature request related to a problem? Please describe.
When using the math, only the non-empty sequences of numbers and letters after
_ or ^ are interpreted as subscripts or superscripts, which limits the
usability of mathematical expressions to denote subscripts or superscripts.

Describe the solution you'd like
I propose enhancing the math interpret the content within {} as either
subscripts or superscripts. For instance, in the expression f^{a+b}_{x-y},
a+b should be interpreted as a superscript, and x-y should be interpreted
as a subscript.

Do you want to contribute to this feature
I'm interested in contributing to the development of this feature if needed.