Title asks it all, i need to run /lpb on the console, is there a way?

Yes, if you're in the proxy console, just dont use a /

So is there a way from the backend to run it?

It should actually be in the backend server

/lpb is a bungeecord command, so you have to use it on the bungee console or in game.

It sounds like you may have mistaken the bungee version of LuckPerms as a solution for your whole network when you actually need to install LuckPerms on every server.

Read this for more info about installing on a network:
https://github.com/lucko/LuckPerms/wiki/Network-Installation

I have luckperms on everyserver, and i want to give players a rank using the console so i can do "lpb user {user} parent set {group} in the console instead of doing lp because i dont think lp syncs ranks

I have read that already and have setup luckperms bungeecord properly

Then you need to figure out why it's not syncing. It shouldn't matter whether you use /lp or /lpb to modify the database if it's all connected properly.

Feel free to jump in the discord to get quicker help.

Hmm okay

See this link https://github.com/lucko/LuckPerms/wiki/Syncing-data-between-servers

nvm i figured it out

It is common curtesy to explain your solution if you found one yourself.
So other people stumbling upon this can have their issue solved too. Also so support people know what’s going on so they can help others better.