overpass draw multiple cities with district boundaries, to calculate population in driving range

Hi there, I want to draw the city(including district) boundaries on Overpass, including district and Xian boundaries.

I want to draw the city, district, and County(Xian in China) level boundaries of those cities: Shanghai, Suzhou, Wuxi, Changzhou, Huzhou, Jiaxing, Hangzhou, Shaoxing and Ningbo. Please help. please

I have tried this code for each province, JS, SH, ZJ

[out:xml][timeout:45];
area["ISO3166-2"="CN-AH"]->.a;
(relation(area.a)["admin_level"=6][boundary="administrative"];);
out meta;
>;
out meta qt;

But what I really want is more detailed district level boundaries of several cities: Shanghai, Suzhou, Wuxi, Changzhou, Huzhou, Jiaxing, Hangzhou, Shaoxing and Ningbo. and Xuancheng

And using that data with the year population data, I think I can calculate the population of a 2 hour driving range which cuts those district boundaries.

Please help