Import Rich Text Format into artifact?

I can copy and paste manually rtf format text into DOORS NG and it appears with underlines and strike-throughs. However, I want to add this to several artifacts, Ideally if it I could import from a spreadsheet with the rtf text in an own coloumn would be great, but CSV do not support this.
What would be the best approach?
As an aside, I am basically having a change register with requirement at n, requirement at n +1, and then the delta as all attributes to the "change ID".