Monatomic Hydrogen certainly exists in nature; it is in fact the most abundant form; in fact monotomic hydrogen is the most abundant molecule in the universe; Helium is a distant second. If you mean it doesn't exist outside of stars, sure. But there's nothing "unnatural" about the sun.
Diatomic hydrogen, like Helium, would all have left the atmosphere long ago, but Hydrogen is chemically reactive, unlike Helium so it's locked up in hydrides, hydroxides, and other forms. Diatomic hydrogen in our atmosphere is produced by the hydrolysis of the ocean surfaces by sunlight.
https://askzephyr.com/stellar-lifting-can-we-extract-helium-from-the-sun/
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A moon full of helium
Scientists believe that solar winds have been depositing huge amounts of helium on the surface of the moon over billions of years, collecting and building up in the lunar soil like dust settling on your desk.
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How could we extract helium from the sun?
We’ve researched the ideas that have been proposed so far and they are, if you pardon the pun, out of this world.
Each solar eruption carries a trickle of helium. So the first thing we’d have to do is increase the amount of solar ejections.
To do that, giant lasers could be used to shoot areas of the sun, causing it to heat up and emit solar flares and winds at our request.
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See? Problem solved. No need to thank me.