Yes, it is a correct construction.
But it is preferable to introduce the idea in the same sentence (like you did in fact).
Yes, this construction is correct as long as the reader/listener is able to quickly understand what is behind the pronoun.
What is referred to is called the antecedent which is somewhat paradoxical because etymologically it means it is located before, not after.
There is a grammatical term to specify this particular case, it is a cataphore.
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