skript-mirror custom effects and expressions

[mel_instagibson]

Does someone know how to fix this? i need a function that does a database lookup for a given player and returns a string but i cant use normal functions for it since they dont allow a delay.
im trying with skript-mirror but there is no documentation or examples that go past 2-liners

expression last permissioncheck %offline player%:
        get:
                return {permissioncheck}
        set:
                set {permissioncheck} to change value
        delete:
                delete {permissioncheck}

effect permissioncheck %offline player%:
        trigger:
                if expr-1.getLastPlayed() is 0:
                        set permissioncheck expr-1 to "Unknown"
                        stop
                else:
                        delay the effect
                        set {_api} to LuckPerms.getApi()
                        set {_uuid} to {_p}.getUniqueId()
                        {_api}.getUserManager().loadUser({_uuid})
                        loop 10 times:
                                wait 1 tick
                                {_api}.getUserManager().isLoaded({_uuid}) is true
                                stop loop
                        set permissioncheck expr-1 to "%{_u}.getPermissions()%"
                        continue
                        send "%permissioncheck%" to ops

command /test <offline player>:
        permission: *
        trigger:
                permissioncheck arg-1
                last delay example
                send "%last permissioncheck arg-1%"

I know this cant work, cant even explain where the effect would get the expr-1 from but thats the best i could stitch together with what i found