Trouble forwarding traffic through proxy server

Hello there, I am using Fiddler Classic as my proxy server

If I manualy enter its proxy server into my phone for instance everything works as expected

The problem comes, when I would like to proxy network from device which does not allow me to manualy specify proxy settings, so I would need to force it to use my proxy

My network looks like this
pppoe-out1 – connection to the outside world
bridge – (dhcp server here, ether2-master, NAT, wlan2 all in it)
wlan2 – where wireless devices connect

My proxy server has the folowing IP: 192.168.88.12
My proxy listenes on port: 8888
My target device (which I would like to proxy requests from to my proxy) has this ip: 192.168.88.25

I tried many rules:

  • /ip firewall nat add chain=dstnat action=dst-nat to-address=192.168.88.12 to-ports=8888 protocol=tcp dst-port=80,443 in-interface=bridge
    Internet doesn’t work on target device, proxy sees nothing

I also tried putting this rule before defconf: masquerade but still nothing

  • /ip firewall nat add chain=dstnat action=dst-nat to-address=192.168.88.12 port=8888 protocol=tcp
    Internet doesn’t work on target device, proxy sees nothing

I also tried putting this rule before defconf: masquerade but still nothing

Now I am trying with ipv4 http website this because if I can make it work on http first, I will tackle https later

Not sure what I am doing wrong
I would just like to force my device to use my webproxy just like entering it direcly into it would

Thanks for Anwsering and Best Regards