Hi Adinator,
It is possible assuming your radio button elements start without a default selection, but will be a bit of work to do it for 11 buttons.
My Example:

I've simply used 2 radio button elements and 50% progress per element.
What I've done:
2 Rectangle's over each other, 1 gray, 1 blue.
Set Width of gray to 1000
Set Width of blue to If(RadioButton1Selected, 500, 0) + If(RadioButton2Selected, 500, 0)
In your case change the numbers to what seems accurate with 11 questions. (total width / 11)
then I made the 'OnSelect' property of each radio button element:
Set(RadioButton1Selected, true)
Naturally this one is for the first one, this has to be RadioButton2Selected for the 2nd, RadioButton3Selected for the 3rd etc.
Lastly you have to make sure that you set these variables back to False upon leaving or resetting the page etc.
If this solves your question please mark as solved, if not let me know how i could help.
Kind Regards