How to mark the first element of a context in kate syntax files?

[EatsKittens]

Basically, I have a context that is started by parentheses and I want to
select the first element of it, terminated by whitespace and give it some
special marking. So if I have (some random (s expression) of (stuff)) then
some, s, and stuff should be selected. The context is simply called
'Parens' in my current syntax file. (I want to bold them)
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