In my experience, many "experts" in specific programming areas have either gathered sufficient prior knowledge to know the right answer, or more likely have enough prior experience to know where and how to quickly find that answer. That's what makes them the experts.
In much the same way, generalists are quick learners, and your expertise is in knowing how to quickly learn anything so you could find the answers. You are quite literally the expert in becoming the expert.
You might start at 0% knowledge, but you can also get to 80% relatively quickly, at which point you too can function on a near-expert level, at least for a while in a narrow enough scope.
Understanding that, if true, will help you find the jobs that need this ability, even if they don't know it yet.
ps. Let us know how it goes. Would love to learn what you learn ;)