How display values as asterix in a dropdown field in WDJ ?

We need to display the values in a dropdown field as asterix ( * ) to the users.But the condition is when we save the details in a screen, the actual value came from backend ( present in the context attribute which is mapped to the dropdown) shoud be saved in the database as it is (and not in asterix format).

Please suggest me how to achieve this in WDJ.

Thanks,

Sitakanta Mohapatra