We actually have JSON inspectors, that may be more straightforward if you care to post a larger sample. The basic method would be something like
values of keys "attributes" of values of keys "ParentKeyName" of jsons of files "c:\whatever.json"
Otherwise, with just the string inspectors, it should be something like
preceding texts of firsts "%22" of following texts of firsts "%22" of following texts of firsts "%22attributes%22:" of lines of files "c:\something.json"
( %22 is the hex-encoded string for doublequote, so we can specify that code to match on literal doublequotes )