I don't believe there's anything to update as I don't believe
Midlothian has switched over to their new system as of
yet. I have not yet heard any usage on their new system.
Others may have, but I haven't.
Don't know what software you are using, but the 'Midlothian'
site frequencies are added to the RR database and can be
easily downloaded using either Sentinel or ARC536. No
talkgroups exist for Midlothian as yet, but I believe that's
due to the fact they are not on the new system yet.
https://www.radioreference.com/apps/db/?siteId=29606