Find maximum of 'jsonb_path_query_array' output

I'm using postgres with a jsonb field that looks something like this: {[[1.2, 'blah'], [3.4, 'blahhh']} I'm extracting the numbers by using: jsonb_path_query_array(json_row, '$[*]') Which gives the jsonb object [1.2, 3.4]. I'm now trying to find the maximum of this array to no avail. I've tried using jsonb_array_elements, but this seems only to somehow truncate the array, returning a single element. So, how can I get the maximum of a jsonb array? preferably, this would be done without the use of a subquery.