Converting a list with numpy arrays into lists in Python

I have a list B11 containing a list of numpy arrays. I want to convert each of these arrays into lists but I am getting an error. I also show the expected output.

import numpy as np

B11=[[np.array([353.856161,   0.      ,   0.      ]), 
      np.array([  0.      ,   0.      , 282.754301,   0.      ])], 
     [np.array([  0.      , 294.983702, 126.991664])]]

C11=B11.tolist()

The error is

in <module>
    C11=B11.tolist()

AttributeError: 'list' object has no attribute 'tolist'

The expected output is

[[[353.856161,   0.      ,   0.      ],[  0.      ,   0.      , 282.754301,   0.      ]],
 [  0.      , 294.983702, 126.991664]]

Copyright Notice：Content Author:「jcbose123」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/74980324/converting-a-list-with-numpy-arrays-into-lists-in-python