custom_zellij_bar.sh

#!/bin/bash

#	Put thins in your i3 block:
#   workspace_command /usr/local/bin/custom_zellij_bar.sh

# Output readale by i3-bar
RESULT="[{
    \"id\": 1,
    \"num\": 1,
    \"name\": \"<flag>\",
    \"focused\": true,
    \"output\": \"eDP-1\",
    \"urgent\": false
}]"


PATTERN=#Fill the pattern your i3 displays after the Zellij session name. For me something like <myusername@machine-somedigits>:cdir

i3-msg -t subscribe -m '["window"]' | {
    while read p; do
        NAME=$(echo $p | jq -r .container.name | sed -n /Zellij/p | sed 's/Zellij (\(.\+\)) - $PATTERN:\(.\+\)/\1 - (\2)/g' | sed 's/\//\\\//g')
        echo $RESULT | sed "s/<flag>/$NAME/g"
    done
}