ECG

no, it's not on the list

ECG is

viewed as a medical device which mean it require official approval from the

government of a country before it's legal for apple to offer

these are

the countries which has provided with said approval so far

watchOS - Feature Availability - Apple

ECG

implies that citizens' medical data be stored by a foreign third-party compnay

without individual approval by the government of said country, and that is not

something all countries feel comfortable with.

This is a user helping other users with tech questions

forum, you are not addressing apple here  just  fellow users