Custom field Static Text

I would like to se a new type of custom field for issues. That is a static text field where you can change the text attributes. The behavior is very similar to Long text with formatting option on. The difference is that this text should be unchangeable for the user. This is not possible today with long text. Before it can be a "read only" field, it task has to be saved first. I would like to have the Static text object in read only mode before the task is created.