Just edit the comment into the question yourself. If you don't have enough reputation to edit, just suggest an edit and explain that you are copying information from the comments.
Moderators don't have any better tools than you do, so it is just as hard for them as it is for us. Yes, mods can edit comments, but here the idea is to add the comment to the question and in any case, markdown is very limited in comments.
In general, you should avoid calling in the moderators for things you can do yourself since that just creates work for the mods. In addition, the more work done by the community the better since we don't want a site that is "controlled" by a few moderators. These are collaborative sites, after all, and editing is an integral part of it.
So, either edit the comment into the post or, if you don't have the time, leave it. But I would argue you should not flag it for mod attention since it isn't something that requires a moderator or even something that a moderator could do better or more easily than any other user.