Hi there @fernando_zuluaga
Real time asterisks is possible only in attended input dialog box for now but anything that you want protected from using a System.SecureString argument and can be fed into during real time. (Reference - Convert SecureString to String - Get Secured Credential - #2 by Lavinia)
Or you can use Windows credentials and get the credential using the activity.
Or you can use a Go Component that can encrypt a text file having the hash/password value required for your purpose.
In browsers the password field converts password to asterisk (Reference - <input type="password"> - HTML: HyperText Markup Language | MDN)
As hardcoded values are not advisable or a best practice the real time password string obscuring is supposed to be only required during an attended automation where the user inputs a secure password. That is the rationale behind it 
Regards