Hi @Anonymous,
At this time, managing data labels conditionally is not something that really works. Recently there's been an interesting solution devised where you can duplicate a series using DAX that only returns asingle data point that you can assign a value to, but I don't think this would work in the treemap scenario. It does work quite well for line charts - I've tested it out and found it quite useful.
Right now, in terms of core support, we're waiting for the Power BI team to add conditional formatting to all the things - they're getting there a bit at a time but it's not quite clear when to expect this for data labels, unfortunately.
In terms of feature requests, this is probably the idea with the highest amount of traction if you want to add your weight to it.
I appreciate this is not the answer you're looking for but wanted to let you know that you're at the same point as the rest of us with your discoveries.
Regards,
Daniel
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