Is there a way in the firewall filter input catch all broadcast traffic?
yes, you can do that with the “address type”.
however, note that some broadcasts will be handled by the router no matter if you filter it or not.
(your filter can still be useful to log and/or count the traffic)
Unfortunately I do not see that in the IPv6 firewall. It does work fine in IPv4 firewall though, thanks.
IPv6 does not implement broadcast addressing. Broadcast’s traditional role is subsumed by multicast addressing to the all-nodes link-local multicast group. You may need to check the following link to know which all-nodes well known addresses you need to filter: https://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast-addresses.xhtml
Maybe ff02::1 ?