If you format as HTML perhaps you could use a table, there's no wysiwyg support for tables so you'll need to hand code it - I have no idea if long text HTML columns support tables. Suck it and see, or read the code.
Or if you format as Plain Text you could simply maintain a separated list - maybe using ; or | as a separator.
FWIW: I would maintain the lists in a OneNote .one file, which does support tables, check lists etc etc. I have an empty proforma template .one file on my desktop that I add to a book as a format file as and when needed.
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