Retrieve block data from file in C++ [closed]

I have a file with the following structure:

File

title1
(
    data1
    ( 
        variableName   1   
    )


   data2
   (
       variableName2 someString someOtherVariable
   )

)

I would like to create a class that would retrieve the information between parenthesis.

What C++ data type is more suitable to collect this information?

Would it be efficient to go into the file, find a keyWord and the opening and closing parenthesis and return a structure with file path, starting and end line. And implement functions to look into the file? Is there something of kind already built into C++?

I would appreciate suggestions on the strategy.