I'm not sure if it is possible to apply a formatting to a textbox the same way you would in excel, I'm not aware of any methods for this, therefore the best you could do would be something like:
or just
However, this can lead to quite a few problems as it will leave you with the format as part of the string, which you will then try and perform arithmetic with - you would probably need to add quite a lot of error handling to cope with if the user enters just a number, or edits the existing value and leaves the currency symbol etc. You already have the currency selected in the box above - it's probably quite a lot of work just to get a symbol that doesn't tell you anything you don't know already. Or have the currency symbol as a label to the left of the textbox.
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