Hi, for BP I did it with sucess like this:
Grab the Unsigned_SBP.tpk from Dante63 GDrive and just signed following the steps on this thread:
Update 09/29/20: 1. The latest Samsung Health Monitor Version 1..1.0.175.Caravana (Thanks Caravana for the Mod) Download This tutorial should work on all Android Phones to enable ECG for your Galaxy Watch 3 and Active 2. BP might also work the...
forum.xda-developers.com
The ECG I just follow that thread and works perfect
The App for smartphone I just grab the MinSDK24-SHM1.1.0.183.root.detection.country.restriction.removed.dante63.apk from GDrive too
And just send the widgets signed via Device Manager
Everything works like a charm now

Im very happy thanks to Dante63