Hi @YITONG LYU ,
I never used this, but after some research, the currency WB put the default symbol if the variable is empty ($).
So you should use the Number WB, and if not mistaken this config should work

Used this based on:
https://www.grapecity.com/wijmo/api/classes/wijmo_input.inputnumber.html#format
and for the N https://stackoverflow.com/questions/17541307/remove-from-tostring0c-formatted-number
Regards,
Luis