That small little pinkish app at the bottom of Galaxy Watch shown above is Modified SHM app for Galaxy Watch.
Modified Samsung Health Monitor App or SHM app for Galaxy Watch lets you check BP and ECG on your Galaxy Watch without any restriction. This app is pre-installed on all Galaxy Watch 4 models and above but Samsung has locked it so that it can only work in BP ECG approved regions. But this is a little modified version of the same official app that lets you check BP & ECG anywhere in the world without any restriction. You can download the app from the following link.
Looks great!