iProxy Online transforms your Android into a proxy hub: multi-access points, auto IP rotation, and remote control. Good for scrapping or affiliate ADS
pkg install tinyproxy
cat > tt.conf Port 8888 Listen 0.0.0.0 Timeout 600 #Allow by default allows clients with any IP
^D
tinyproxy -d -c tt.conf # -d means no daemon
and whatever you fancy on the client side.
The trick is to disable WiFi internet and use data on a phone and then connect to client's hotspot, so client can use the proxy on the phone.