It's worth pointing out that this is by far the most common expression in most contexts.
But it's a bit informal, so it's also worth noting that this one is more appropriate in some formal contexts.
OP's versions with worthy are completely unnatural (in fact, "worthy" is probably a word you never really want to use - it's usually somewhat dated, formal, and/or used facetiously).
And depending on context, it might be a bit "presumptive" to explicitly mention the addressee ("you") in this way (if it's your boss at work, say). In that case, the question arises as to in whose opinion the information is important. You don't want to get bogged down in cumbersome/deferential phrasing like "You may think it's worth me informing you that [blah blah]"