Reportable field for internal idea comment date

What is the challenge?

Currently, adding the field "Idea last internal comment" provides both the date and the text in one value. This field is not available for calculation columns, so I cannot sort by date of comment.

What is the impact?

Better reporting

Describe your idea

Ideally, the solution should split this field into two, one field for the date and another for the comment itself similar to what we do for the "Idea last portal comment date"