While Form Builder doesn't support complex DAT tags such as ~(*gpa) - it does support simple student field tags such as ~(first_name) and any other student field whether it is a core student field, a custom student field, or a database extension student field. Right now, only the Text Block element supports this. To use it, simply wrap the student field with curly braces like this ... {{last_name}} and it will appear to the responder as the student's last name.