I got the same requirment to popup values in cascading custom field, because of an emergency to deploy I didn't got the chance to develop the code for it, I directly execute the more than tousands of query in DB directly and restarted the JIRA.
insert into customfieldoption(id,customfield,customfieldconfig,parentoptionid,sequence,customvalue,disabled)values(10713,10300,10400,10300,1,'XXX','N')
// Analyse dependencies as well for primary keys,
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