configuring Zerotier Full Tunnel Mode on routerOS

I would like to configure my router RB40011 as a gateway for my zerotier network as proposed https://zerotier.atlassian.net/wiki/spaces/SD/pages/7110693/Overriding+Default+Route+Full+Tunnel+Mode. This is to route all our zerotier devices internet traffic through the router (sort of using the router as proxy)
We do not have a static IP address, so on a simple linux pc, the config would default to
sudo iptables -t nat -A POSTROUTING -o $WAN_IFACE -j MASQUERADE
sudo iptables -A FORWARD -i $WAN_IFACE -o $ZT_IFACE -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i $ZT_IFACE -o $WAN_IFACE -j ACCEPT

as proposed in the link.
So on the router i set :
/ip firewall nat

 add chain=srcnat action=masquerade

/ip firewall filter

 
 add chain=forward in-interface=ZT_IFACE out-interface=WAN_IFACE action=accept
 add chain=forward in-interface=$WAN_IFACE out-interface=$ZT_IFACE  action=accept connection-state=established,related

But it does not work (no response on pc used as client) and nothing happened on the reply forward chain as shown on the attached file.

Firstly, is it possible to do this?
Secondly, if yes, how to improve the config to do it?
Capture d’écran de 2022-04-30 15-42-00.png

Sorry have not mastered zerotier yet, on my to do list one day…
In the meantime this is the best reference I am aware of vis-a-vis ZT and mikrotik!
http://forum.mikrotik.com/t/zerotier-on-mikrotik-a-rosetta-stone-v7-1-1/155978/1 (thanks to amm0!)

Thank you for your reply
I have gone through this link from top to bottom,
No solution so far.
I keep looking