RPi 3

[snippsat]

QT designer is not free.

It's free install with pyqt5-tools.

pip install pyqt5-tools

Then i can start it from anywhere with designer,as Python is in my Path.

C:\1
λ designer

designer create .ui files that can be converted,or as in example under dynamically load the .ui files by using the uic in PyQt5.

from PyQt5 import uic, QtWidgets
import sys
 
class Ui(QtWidgets.QDialog):
    def __init__(self):
        super(Ui, self).__init__()
        uic.loadUi('SomeUi.ui', self)
        self.show()
 
if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    window = Ui()
    sys.exit(app.exec_()) 

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I got received data from HTTP Webpage. Raspberry GUI / Screen should show us “distance value” like HTTP Web Page.
What should I do for Raspberry Pi 3 with Graphical User Interface (GUI) on my project?

I would have used Flask as web-UI and not GUI for this.
Look at this this post,where i link to some stuff with IoT and Flask