Hello amita,
Yes, there is an available Samsung Health API, named Samsung Privileged Health SDK. The Samsung Privileged Health SDK is specialized for Galaxy Watch4 devices or later. Currently, the Samsung Privileged Health SDK is available for selected partners only. You will also need partnership access with Samsung Health if you want to obtain this SDK. To join, you can apply for partnership. You can learn more about this SDK by reading the documentation available here.
And there is an available Health API for android also, called Samsung Health SDK for Android. This SDK provides secure access to Samsung Health data with applicable data types. Even You will need partnership access for this SDK too. You can learn more about this SDK by reading the documentation available here.|
Thanks