See my iPad don’t haf Battery health

That is correct.

iPads have much larger internal batteries that last much longer than any smart phone battery.

So, checking for battery health on a new-ish iPad model is not really necessqry.

iPad batteries can last anywhere from 4-8 years, or so, depending on usage cases.

So, Apple thinks that this is NOT a neccessary feature on any iPad model.

Battery health would really only be an issues after an iPad is about 5-6 years old, or so.

If you think otherwise, you can send unacknowledged feedback, directly, to Apple here.

Tap the link below.

Feedback - iPad - Apple

The battery health feature is exclusive to iOS for iPhone.

iOS/iPadOS for iPad has never had the Battery Health feature - most likely because iPad batteries are both considerably larger and have a much longer service life. 

An iPad battery is rated to maintain at least 80% of its initial capacity after 1000 full charge/discharge cycles - whereas an iPhone is rated to have 80% of initial capacity after 500 full cycles.

There are third-party software packages available that can access battery cycle count. Popular choices for Mac are Coconut Battery and iMazing - whereas iMazing is available for PC.

https://www.coconut-flavour.com/coconutbattery/