Hi, I notice that the latest PennyLane supports group measurement of Pauli word. However, when I try to measure two Hermitian matrixes |00><00| and |01><01|, it raised TypeError. Currently, is this type of group measurement not supported? Or is there something wrong with my code? Here is the code.

```
import pennylane as qml
from pennylane import numpy as np
def get_projector_of_computation_basis(index, n_qubit):
"""generate projector of computational basis as observable
Args:
index (int): the index of computational basis |i>
n_qubit (int): the number of qubits
Returns:
_type_: _description_
"""
state_01 = {'0': np.array([1, 0]), '1':np.array([0, 1])}
state_basis = 1
index_bin = bin(index)[2:].rjust(n_qubit, '0')
for i in range(n_qubit):
state_basis = np.kron(state_basis, state_01[index_bin[n_qubit-i-1]])
return qml.Hermitian(np.outer(state_basis, state_basis), wires=[i for i in range(n_qubit)])
dev = qml.device("default.qubit", wires=2)
@qml.qnode(dev)
def circuit(x, obs=None):
qml.RX(x, wires=0)
qml.Hadamard(wires=1)
qml.CNOT(wires=[0, 1])
return [qml.expval(ob) for ob in obs]
obs = [get_projector_of_computation_basis(0, 2), get_projector_of_computation_basis(1, 2)]
print(circuit(0.5, obs))
```

Looking forward to your advice.

Thanks.