Hi, MomoCoin
sorry for necro
it seems that
https://github.com/coinspark/python-OP_RETURN/has direct bitcoind-relying implementation, although I never used it.
There are also manual instructions on this forum how to do it with bitcoin-cli.
Yesterday I successfully did it with Electrum, which is a bit more tricky.
Not sure about Bitcore ports for PoS bitcoind clones....