Health connect app shows blood pressure data that is entered in Samsung Health manually however, it does not show bp data that is sync’d from Samsung Health Monitor(SHM).
SHM is an app from Samsung to extract blood pressure & ECG from Samsung Galaxy watch and synch to Samsung health.

Health connect Toolbox by design should display all types of bp data entered & or synched from other apps into Samsung Health app but it skips SHM data. I have downloaded data from Samsung health app into an excel using an app provided option. I can see BP data synched from SHM which means this data in also there in Samsung Health backend. Here is link that I followed and expect this to work.
https://developer.samsung.com/health/blog/en/health/blog/accessing-samsung-health-data-through-health-connect