https://wccftech.com/watchos-7-5-for-apple-watch-now-here-with-podcast-subscription-ecg-support-for-malaysia-and-peru-more/

Apple Watch users can now go ahead and download watchOS 7.5 over the right now. The update includes a handful of changes including expanded ECG support in Malaysia and Peru.

Those living in Malaysia and Peru will be pleased to learn that ECG has been enabled on their watches as long as they have a Series 4 or above model. All you have to do is install the watchOS 7.5 update and you are golden.