how to get files of a specific folder path in sharepoint using /lists graphapi

Not sure if this will get what you're after, but you could try the search endpoint.

https://graph.microsoft.com/v1.0/search/query

And in the Request Body

{
    "requests": [
        {
            "entityTypes": [
                "listItem"
            ],
            "query": {
                "queryString": "path:https://YOUR_TENANT.sharepoint.com/sites/YOUR_SITE/LIBRARY/FOLDER1/FOLDER2"
            },
            "fields": [
                "id",
                "title",
                "createdBy",
                "createdDateTime",
                "lastModifiedBy",
                "lastModifiedDateTime",
                "webUrl",
                "contentType"
            ]
        }
    ]
}

One caveat though is that search will only return the last published version of a document depending on the library settings.

If you just wanted to return files (and not folders) you could add IsDocument:True to your query string.

"queryString": "path:https://YOUR_TENANT.sharepoint.com/sites/YOUR_SITE/LIBRARY/FOLDER1/FOLDER2 AND IsDocument:True"

I'm not sure if we can filter with /list/GUID/items as you are after.