Get Microsoft Graph AccessToken from SharePoint ContextToken in RER


I have registered RemoteEventReceivers on my SharePoint list. I can receive remote events in my custom code. Is it possible to receive Microsoft Graph AccessToken from SharePoint ContextToken? I have to retrieve some data from Microsoft Graph in the context of the logged-in user. I know that I can use client id and client secret for it but I want to store correct value for Author and Editor field instead of System Account.