You seem to have ignored most of what I said in my last post, and focussed on why you need to stick with the Uno + ESP-01
In this forum you have access to people with lots of knowledge about how to get the Uno + ESP-01 working with Blynk. You aren’t making the most of that experience by providing any detail about what you’ve done so far to get this hardware working with a basic sketch.
As far as the pulse oximeter hardware is concerned, you seem to believe that you…
so you’ll be aware of the challenges that you face getting this working alongside Blynk.
Pete.