Global arguments that can be used throughout multiple commands. Since mimu cant remember arguments from other commands I suggest you let us create arguments that can be stored in variables or something similar that can be used throughout multiple commands. Example, person tries to start a battle with another person for a set amount of currency. That currency then gets stored into a global variable (that will be set using the argument) which will proceed to continue throughout the whole battle system.
this feature doesn’t exist but a workaround you can do for now is to use items ! (/shop add to create the item then {modifyinv:ITEM|AMOUNT|@USER} to add it or remove it)