How to center values in my dictionary by one of keys values from it?

Question

I have a dictionary:

{\'A1\': array([1.        , 0.8787]),
 \'A2\': array([ 0.73376, -0.14261]),
 \'A3\': array([0.9179 , 0.59273]),
 \'A4\': array([ 0.869011, -0