psatkha
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A long time ago, I managed to import animations from Heroes 5 into Max using plugins for GR2. Then I lost the plugins, searched for a long time, but couldn't find them. But the point is that it is theoretically possible.
You can try the plugins for GR2 that the source attached to his video about importing models.
Well... I have some, I remember struggling with the animation of the skeleton-axe wielder, i.e., I loaded it, but I couldn't export the modified version...
Added 1 minute ago
And by the way, I suggested in another topic to ask Nival for the engine from Heroes 5 so that they could rework something in the game without the source code.
One of their former employees said that they can't do that because all rights belong to the publisher!
С уважением, Psatkha (Псатха) 
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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1
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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1