[closed] "No echo input" presentation for RTC attributes

Is it possible to insert a "no echo input" presentation in a RTC work item form?
I mean: a presentation where the value of an attribute is displayed as a series of bullets, or asterisks, like when you insert a password.
Also, the attribute value should not be displayable in queries.
These features would be useful when you need to store any confidential piece of information in a work item.
Any alternatives are also welcome.