Json to dropdown boxes

Database & APIs

Hello friends i have a json file and it contains all cities, their districts and schools in districts. I saved it in media assets and tryin to use with api call. I am using 3 dropdown box for list them dynamicly. I can list cities correctly but i cant list choosen citys districts. What can i do to do this. Maybe its really easy but i am losing my mind at the end 😦 if i can use any variable in json path it could be very easy but there is no chance that i see. Can someıne please help me in this situation? I appreciated it

What have you tried so far?

i tried all thing from whatced tv on tutorials

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