How to forward unicast UDP packet to broadcast

RouterOS General
1

I have an external IP address on the router + NAT to my home-local net. I want the wake-on-lan unicast UDP packet from the Internet to my router be forwarded to the local home network as a broadcast UDP-packet.

So, I cretaed the nex trule:

[admin@MikroTik] /interface/bridge/filter> /ip firewall nat print
Flags: X - disabled, I - invalid; D - dynamic 
...
 2    ;;; wake-on-lan
      chain=dstnat action=dst-nat to-addresses=192.168.1.255 to-ports=9 protocol=udp in-interface-list=WAN 
      dst-port=9 log=no log-prefix="" 
...

But it doesn’t work. The sniffer/torch doesn’t see the corresponding broadcast going to the packete interface. If I change the address to unicast address of the my home-local machine (192.168.1.10 for example) then the packets go through normally. But I want the wol packet to be broadcast.

I figured out how to bypass this. I created a permanent entry in the arp table 192.168.1.15->FF:FF:FF:FF:FF:FF and specify 192.168.1.15 in the firewall rule.
This works with any IP addresses of my network except 192.168.1.255.

But i think adding virtual broadcast host is bad way. How to do it right?