I just told you how… you can do all sorts of external displays and sensors at the same time as being connected to the Blynk App if you code things properly in timed loops.
Ultrasonic sensors are picky on timing, but it is workable…
And as for your viewing of calculated vs raw data, well that is simply up to how you process the data before sending it to the LCD (or App… or both)… not really a Blynk issue.