Echoing Ed7789, I also do not know of a windows app to check the estimated iPad battery health. However, performing a web search will provide Windows compatible “solutions”. I didn’t list any of the search results because I wouldn’t recommended small app developer for Windows found on the internet. That’s not to say it’s a good or bad app, it’s to say I personally (especially for Windows not in the MS Store) do not install apps who have a dev/company I’m unfamiliar with.
I’m a fairly long time IPad user. If your iPad has very noticeably begun needing more frequent charging, the health estimate can be useful to see how much time is left. But IME (just IME) the death of an iPad battery has quite a downward slope as it gets very close to the end. You’ll see the battery, slowly at first, overall slope downward through its life with the slope increasing a bit over the months/years. but the last month or two is a black diamond ski trail type slope. It’s now on a quick slide into the afterlife. BOL..