ListChat API for App permissions

I am working on an application to download all chat messages, and it is necessary to use the App permissions. 

However there is one API missing:

https://docs.microsoft.com/en-us/graph/api/chat-list?view=graph-rest-1.0&tabs=http

Although I can still workaround it, it makes the application very inefficient.

Is it possible to have it enabled somewhere? Thanks.