So, I think the answer is a "no", but if this does drag on and Dame threatens a hold out (Portland) or no show (anywhere but Miami), does the league step-in? I'm not sure the CBA would give any wiggle room here for them to do anything but none of these outcomes outside of a competitive trade market is good for the league. A defacto force trade after the first year of a massive, team-exclusive extension for undervalue is terrible really for any team in the league who isn't an S- tier destination. Dame sitting out or performing poorly on purpose is terrible for Portland and a bad look for the league especially with a premier rookie in that market (Henderson). There's a lot of latitude in player trade demands and Dame, more than many, has valid reason to want one and Miami is absolutely a great destination, but there's a huge difference between many other trade demands we've seen and what this is developing into which is basically "trade me to Miami or I'll be the biggest problem you can imagine and no I won't go to any other good destination, so take Miami's scraps".
Unrelated to the above really,,
I know it's been talked about, but Dame is a Top 15-20 player - Miami would be entirely justified in saying "no" to a Bam trade (frankly they should say no) but Portland would be foolish to make it without him or some other major player value until other interested teams refuse to offer their similarly ranked players. If Tyler Herro is the best player in the deal on a 4/130 deal? That'd be insane.
Like, we don't have to go that far back. Kevin Durant is a better player than Dame of course (#4 on the Ringer's rankings to #14 for Dame) but of a similar age - both on long term deals where they want out. The Nets got four first rounders, a pick swap, Mikal Bridges (#37), Cam Johnson (#94) as the key pieces here. Dame isn't Durant, that return shouldn't be expected, but Herro is in the mid-70s on the Ringer list on a bad contract, the Heat picks are crapshoots and there are fewer of them.
In a league where success and failure hinges on those Top 20-30 type players, in what would should Portland ever consider this unless the market for Lilliard is truly depressed...and given that, I think we can see more on why Dame might be taking this approach - he and his agent almost certainly know multiple teams can outgun Miami on this one.