Swagger documentation for facebook graph api

Can we build a swagger definition in a json format for facebook graph api?

How do you graph API on Facebook?

Go to Tools – Graph API Explorer to generate Access Tokens for various kinds of API that you would like to use in your app. Choose the app and kind of token you need in the drop down menus in the left part of the screen. Then click “Generate Access Token”.

Is Facebook Graph API a REST API?

As you suggested, the Graph API, just like the Legacy REST API, is in fact a RESTful API.

Is Facebook Graph API deprecated?

Graph API Version Deprecations: August 3, 2021: Graph API v3. 3 will be deprecated and removed from the platform. November 2, 2021: Graph API v4. 0 will be deprecated and removed from the platform.

Yes you can, it has already be done by Kin Lane the API Evangelist.
His work his available on the API Stack website (search Facebook in the page), all files are in a github repository.