I know exactly what it is, I’ve claimed it myself (for a British company salary - it’s for money earned from any foreign employer, not just a US company). Most USC’s living overseas and petitioning a spouse will claim it too.
But it’s not relevant unless the income will continue from the same source when you return to the US. For example, somebody that will be resigning from a job to move to the US can’t use that income to qualify. It’s still not clear to me from your last response if your job/income source will be continuing once you move back? If it will then that’s fine and you just need to take evidence of that to the interview. If it won’t, you’ll need assets or a joint sponsor.