# Representing Qubit Operator in Circuit

I am trying to represent a quantum circuit schematically with some operators in QISKIT. I know I can create some operator with Operator() in quantum_info from a circuit circ like

Q1=quantum_info.Operator(circ)


To add the $$Q_1$$ operator to the circuit I can do

circ.append(Q1, [0, 1])


which adds $$Q_1$$ operator to the circuit and maps the 0th bit of the circuit to the 0th bit of the $$Q_1$$ operator and 1st bit of the circuit to the 1st bit of the $$Q_1$$ operator. The resulting circuit for a 4-qubit circuit circ is

I was wondering how to edit the label of the operator. Right now it's just showing Unitary in the circuit block. I tried to find this in the QISKIT documentation. So far, no luck!

One way to do that is to use QuantumCircuit.unitary method as follows
circ.unitary(Q1, [0, 1], 'Custom Label')