add lore at line

[Shadow501pl]

so i tried adding custom enchants and i need them at a certain line so

command /customenchant [<text>] [<int>]:
    permission: admin.enchant
    trigger:
        if arg-1 is not "sharpness" or "efficiency":
            message "&6&lSkyblock items&7: You need to specify the enchant you want!"
        if arg-1 is "sharpness":
            if arg-2 is not set:
                message "&aSet arg-2"
            if arg-2 is more than 0:
                if arg 2 is more than 5:
                    message "&cToo high value"
                    stop
                if player's held item is not air:
                    loop uncolored lore of player's held item:
                        add 1 to {_count}
                        if loop-value contains "sharpness":
                            message "&cYou already have this enchantment!"
                            stop
                    set {_math} to {_count} - 3
                    # set the 1st line of the lore of the player's tool to "whatever"
                    add "sharpness %arg-2%" at line {_math}th to the lore of player's tool

this is what i have now
it says that its not a text and if i swap order it says unknown effect

 

[Deleted member 9590]

Do it like this:

set line {_math} of player's held item's lore to "whatever"

 

[Shadow501pl]

Do it like this:

set line {_math} of player's held item's lore to "whatever"

Sorry for late response but i dont want to set a line i want to create one at a specific line