The number comes from the CDC and is the chance of any given American getting struck by lightning in any given year. So average number of Americans struck by lightning divided by US population. An individual’s chances can go up significantly by being where lighting is likely to strike, but that doesn’t affect the average chances.
See https://www.cdc.gov/disasters/lightning/victimdata.html
When chances of getting hit by lightning is one in a million that means that 8000 people around the world gets hit by lightning, about 350 people in the US. This is a fairly simple calculation. Just look up in records to find out how many gets hit by lightning and then divide by the number of people those records cover.
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