Steps to reproduce the issue

Add custom field type SQL. There is no possibility to set a header option to the dropdown field. So I'm also not able to leave the value of the field empty if needed.

Expected result

A new field type Text in der Fields XML, maybe named "Header" where we can leave a String or maybe also a JText String.
If field is filled a header attribute is set for the SQL-Field, if empty there will be no header and the first result from the SQL-Quer will be shown.

Actual result

No header field, no good possibility to leave the value of this field empty or set a default value for start.

System information (as much as possible)

Additional comments

It would only need a few lines of code to add this feature in the PHP and XML