use "abs" with @ operator in CVXPY

Question

I want to do the absolute operator with CVXPY: abs(A @ x).

From here cvxpy objective function error involving MulExpression I understand that I cannot use np.abs since it is overwritten from CVXPY, so i tried using the abs, as in this documetation: https://www.cvxpy.org/tutorial/functions/index.html,

example taken from 
import cvxpy as cp
import numpy

# Problem data.
m = 10
n = 5
numpy.random.seed(1)
A = numpy.random.randn(m, n)
b = numpy.random.randn(m)

# Construct the problem.
x = cp.Variable(n)
objective = cp.Minimize(cp.sum_squares(abs(A @ x) - b)) #here i get the error
constraints = [0 <= x, x <= 1]
prob = cp.Problem(objective, constraints)

print("Optimal value", prob.solve())
print("Optimal var")
print(x.value) # A numpy ndarray.

OUT :

TypeError                                 Traceback (most recent call last)
<ipython-input-26-0483d2aabc95> in <module>()
     11 # Construct the problem.
     12 x = cp.Variable(n)
---> 13 objective = cp.Minimize(cp.sum_squares(abs(A @ x) - b))
     14 constraints = [0 <= x, x <= 1]
     15 prob = cp.Problem(objective, constraints)

TypeError: bad operand type for abs(): 'MulExpression'