Adding an OP_RETURN output to a psbt using `embit`

op_return.py

"""
  dependency: pip install embit
"""
from embit import compact
from embit.psbt import PSBT, OutputScope
from embit.script import Script

class OPCODES:
    OP_RETURN = 106
    OP_PUSHDATA1 = 76

psbt = PSBT.from_base64("cHNidP8BAHQC...")
raw_payload_data = "This is your message".encode()
data = (compact.to_bytes(OPCODES.OP_RETURN) + 
    compact.to_bytes(OPCODES.OP_PUSHDATA1) + 
    compact.to_bytes(len(raw_payload_data)) +
    raw_payload_data)
script = Script(data)
output = OutputScope()
output.script_pubkey = script
output.value = 0
psbt.outputs.append(output)
print(psbt.to_string())

Thank you for sharing!