How to tunnel all traffic of a QEMU VM through a Proxy?

I'm trying to make a VM in which all its traffic goes through a proxy (like a tor proxy or any other ip/port proxy). I've found this article showing that it is possible in command line, however I'm using the GUI manager (virtual manager) and didn't found in anywhere a place to setup a proxy for the VM. So I'm asking if is it possible to make through the GUI?

I want to make it on the host machine so it doesn't happen to make any connection by mistake inside the virtual machine to outside using my default connection.

The answer to this question is similar to tap + tun2socks for making a QEMU virtual machine go through a proxy

You just need to replace this step in the answer linked above:

Use the following two parameters to configure the network in the qemu virtual machine startup command:

-netdev tap,id=net0,ifname=tap0,script=no,downscript=no
-device virtio-net,netdev=net0

Replace it with:

Click Virtual Hardware Details -> Virtual Network Interface -> XML

Make the following changes:

<interface type="ethernet">
  <mac address="52:54:00:02:4e:80"/>
  <target dev="tap0" managed="no"/>
  <model type="virtio-net-pci"/>
  <alias name="net0"/>
  <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/>
</interface>

The rest of the steps stay the same.