Need SecondSearch base on Header with 1st Search to match row

[nojoke1105]

Here is 2 worksheets, Source and Result

Source was directly cut the XML/JSON on dynamic tag order.
Expected result will be first MATCH Column A (the Key, 0), get the row#, example is 4.
need second search base on SOURCE!$4:$4 from above result, find the Header h3 in somehow Column
Maybe 2, 4, 6 or NOT exist.
Take the next field if found h3

The attachment is just 4 rows as sample case.

Thank you for your support.

p.s. As company privacy, I am NOT allow to use any online tool to convert the xml.