I hope add a built-in withdraw feature to make it easy for players to sell their experience at the auction. And adding maximum/minimum Withdraw quantities

Command:
withdraw - Withdraws money onto a item
withdrawxp - withdraws experience onto a item

The following is an example format:

numbers:
max-exp-withdraw: 30970
max-money-withdraw: 1000000
min-exp-withdraw: 7
min-money-withdraw: 1

banknote:
signed:
item: "PAPER:0"
name: "&r&lBank Note &7(Right Click)"
lore:
- "&rValue &a${value}"
- "&rWithdrawn by &7{signer}"
bottle:
signed:
item: "EXP_BOTTLE:0"
name: "&r&lEXP Bottle &7(Right Click)"
lore:
- "&rValue &7{value} EXP"
- "&rWithdrawn by &7{signer}"

You can already buy and sell experience through Essentials signs, but I agree with @Xeyame that this feature would be better served by another plugin like the one linked above.