Uploading Files to SharePoint via Graph API

Question

Is there a way to upload files to SharePoint without the raw binary file? My input value only has either base64 and utf-8 which are different from binary. This is an integration I'm trying to do, I understand using javascript window.atob does the trick to upload files or using Buffers, and file readers and such does the job. But I'm developing in purely server-side scripting wherein I'm only able to do REST APIs thus I can't insert javascript code and the like since the only Input I have are either base64 and utf-8.