You got mielenkiintoinen right. For the other one, you can sometimes talk about someone's interest in something, but your example is awkward, though not necessarily incorrect.
I'd use Olen kiinnostunut historiasta / I'm interested from history.
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You got mielenkiintoinen right. For the other one, you can sometimes talk about someone's interest in something, but your example is awkward, though not necessarily incorrect.
I'd use Olen kiinnostunut historiasta / I'm interested from history.