Hi,
As Zurga said, it is not in the Gedcom standard yet.
What you could do are 2 things:
1:
Go to the forum of the group that is working on the latest Gedcom standard version, and in their forum ask to have this tag added.
You can find it here:
https://gedcom.io/community/2:
Until the tag is added to Gedcom (if this group will think it will be) you could add the information like this
Add a Note tag, on the first line add MDCL. Just that, only those 4 characters.
On the next lines you can add the information, preceded by, for instance, DATE: , or COND: , or RSLT: etcetera.
That way other programs will not skip the info, they will just process it as any other note.
In Ancestris you can then create a report, with just this info, see the TODO report. You would use MDCL instead of TODO.
If that tag will ever be added, you can add the info from your notes into that tags sub-tags, by hand.
HTH
Regards,
Mother10