Marking packets from different wifi-iface

An nft style include (implicit or explicit) with position ruleset-pre or ruleset-post should do the trick.

See also Help me update my HFSC shaper scripts for fw4/nftables - #116 by jow

# /usr/share/nftables.d/ruleset-post/01-my-bridge-table.nft

table bridge mangle
flush table bridge mangle
table bridge mangle {
        chain prerouting_mangle {
                type filter hook prerouting priority -150; policy accept;
                iifname "wlan1" meta mark set 0x1
                iifname "wlan1-1" meta mark set 0x2