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Hi!
May I add any unaligned forces (Warhammer Legends) to any army in 10th ed? Like an Ambull to a Tau army?

Yes.

https://www.warhammer-community.com/warhammer-40000-downloads/

You need Legends FIeld Manual for points and Legends: Unaligned Forces for the Ambull rules, which says:

You can include Unaligned Forces units in your army even if they do not have the Faction keyword you selected in the Select Army Faction step. The combined points value of Unaligned Forces units you can include in your army depends on the battle size, as follows:
■ Incursion: Up to 250 pts
■ Strike Force: Up to 500 pts
■ Onslaught: Up to 1000 pts
No Unaligned Forces models can be your Warlord.

Thank you, sir!