I’m creating QTI v2.2 XML for a multiple-choice question.

The question contains fields such as prompt, responses, correct answer, description, language, grade (standard), etc.

For prompt, responses, and correct answer, there are predefined tags in QTI v2.2, which I am already using.
However, for description, language, and grade (standard), there are no predefined tags in QTI v2.2.

Should I create custom tags with their names and structure on my own, or is there another way to include this information?