There was a great quest tracker I used for years (and have forgotten the name). If others in the party had the addon, it showed objectives for everyone:

(3) Rat Tail Collector
Kobold Rat Tails - John (2/10)
Kobold Rat Tails - Jane (2/10)
Kobold Rat Tails - JimTheRatKiller (7/10)

Would love to see something like this!

Righto, I've decide how I want to do at least part of it, so I will make a partial implementation of this my next project.

The first step will be to have the information available in a tooltip, adding display in the actual tracker will be saved for later.

I do have plans to include something like this. Just not entirely sure when yet, or the specifics of the implementation.

The best option is probably to keep the underlying sharing library-based, which would allow any addon to use it.

I'll probably get started on this soon, but could take some time to get it "just right".

Well, the goods news is that I've written the code required for the first implementation of this. The bad news is that I can't use a trial account to test it, and make whatever adjustments may be required.

Partial implementation in. Not properly tested in a group yet, but the functions behave as expected when called. Going to look at catching updates from other addons as well.

And some testing seems to indicate that this is working.

might be better to put such info in the tooltip you are planning to implement.

There is a tooltip. May need to be configured to show. Right now it only works for others running AQT, though. I am planning on adding the ability to "eavesdrop" on updates sent by other addons as well, but I do not have a timeframe for this at the moment.