The following query returns 'True' if the JSON column has a child named 'schools' that is an array whose second element has a child named 'location'.
SELECT eno, 'True'
FROM my_table
WHERE edata.ExistValue('$.schools[1].location') = 1;
Result:
*** No rows found ***
The JSON column contains a child named 'schools' which is an array, and the second element of the array does not have a child named 'location'; therefore, the method did not return any rows.