Doesn't appear to be possible, FT. Every time I try to enter HTML tags to align the text the capsule editor strips them out. It also doesn't seem keen on preformatted text that is centered or justified.
Although that may be the capsule editor not working to well with Open Office or Linux. I can only suggest you give it a try and see what happens for yourself, depending on what software you are using.
The only clumsy work-around that I can see is to write it as you want it on your computer and then take a screen grab of that and put that in a picture capsule.
Unless anyone else knows a way to make it happen.