At a bare minimum, teams that plan via "story points" or other time units ought to count meetings in those scores. When they don't, you start getting teams that either "get nothing done" or have to work nights and weekends because planning meetings are displacing all their intended work.

For actually tracking Meeting Points, one option might be to make them a project metric? As in: "We predict our project will consume 21 Meeting Points, if we go over 25 that's a failure to be analyzed afterwards like overruning schedule or budget, if we're under 15 we're probably budgeting wrong".