Citing a Facebook Messenger chat

To start, Happy Thanksgiving Eve to those of you in the US.  

Earlier this month, I had a chat on Facebook Messenger with a distant cousin in which she shared some information about herself and her lineage that I would like to include in my personal data file in TMG (The Master Genealogist).  I copied the conversation to a word document (transcript?) and then looked at EE and in the archives here without finding a suggested template for the citations.  I decided to use the "PRIVATE HOLDINGS: INTERVIEW TAPE & TRANSCRIPT" model from EE 3rd Edition p110, with a note added to the first reference note:

[Informant] ([city], North Carolina), interview by Greg Lovelace, 11 November 2019; transcript privately held by interviewer, Charleston, South Carolina.  The interview was conducted via Facebook Messenger (https://www.facebook.com).

The short note:

[Informant], interview, 11 November 2019.

The source note:

[Informant]. [City], North Carolina.  Interview by Greg Lovelace, 11 November 2019. Transcript. Privately held by interviewer, Charleston, South Carolina. 2019.

Are there any suggestions on how to improve this?  Is there another model I should use instead?