Well if you look at the only place vBulletin shows if a group had unread discussions it's in the template: socialgroups_grouplist_bit
And the exact condition is: <if condition="!$group['is_read']">
So that's a start but of course that won't work by itself on forumhome because on forumhome no group is defined.
Likely you'll need a pretty extensive custom plugin to do this.
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