I don’t know if I can help, but I did something similar recently myself by sending my mom an email telling her I’m a crossdresser. I know face to face meetings are what a lot would rather have, but there is a good side to doing it by message. This way they aren’t put on the spot to accept or deny it right away, it could allow them time to process everything and figure out if they have any questions or concerns they may want to discuss. Just be open and honest with them, tell them from the heart and let them know you’re willing to talk to them about it if they have questions.
Though granted I can’t say for sure this method works since my mom hasn’t accepted or denied Jessica, but it could be an icebreaker that is needed.