You can try to enter *##4636##* to enter the mobile phone information interface to see if you can check the battery health.
If you still can't find the battery health after typing *##4636##*, it may be because the system version of the mobile phone doesn't support the battery health function, or it may be because of the mobile phone hardware. I suggest you try to upgrade the version of your mobile phone system, or contact the after-sales service of your mobile phone to check your mobile phone.