Mikrotik webproxy setup?

Question

Mikrotik

Need help setting up:
How to implement this scheme.
1. The Internet comes to the router via eh1 and settings are given for dhcl ip address white. you can connect to it from all
2. The router must connect to 10 vpn services at once
vpn 1
vpn 2
vpn 3
vpn 4
vpn 5
..
vpn 10
all connections must be active at once.
The task is as follows
so that a proxy server is deployed on the router and when we access the proxy
10.10.10.1:8000 we go to the Internet through vpn 1
10.10.10.1:8001 we go to the Internet through vpn 2
10.10.10.1:8002 we go to the Internet through vpn 3
10.10.10.1:8003 we went to the Internet through vpn 4
how to implement this setting. you can paint with an example)
thanks everyone for the answers

Answer 1

try marking the packets by ports and prescribe in the ruts to whom where.

Answer 2

I have an opinion that this is impossible to implement on Mikrotik.

Answer 3

Make several src.address on the proxy and catch them in the mangle when you go online