In the existing Odoo system,

All your chart of accounts will represent in accordance with Company currency only,which is correct and legitimate one.

Hence presently, no such option exists to show in different currencies...

But coming to this, I think you need to modify the things in such a great extent to achieve your requirement, I suppose you can have an additional field, (secondary currency amount field), and evaluate the monetary process exactly the same way done for all accounts...

In standard, they convert the source amount to Company Currency, If you manage to achieve it with your custom field, then all you need to do is convert the source amount to your required Currency..

But as being said initially, it is quiet tricky process, and you need to replicate the whole thing to meet your requirement, and certainly not easy as such..

So check it out, how you can do in much feasible manner.. Or may be somebody might give you an feasible answer..

Hope for the best! Good Luck...