Hi @Prerit Pushp
Per my research, we can only upload one file at once call the graph api. There is no such api to store multiple files in body and upload them to SharePoint library at once. As a workaround, we can loop to run this api and request multiple times to upload files collection. I will recommend you to use Power App, please refer to the following url to reach your requirement
https://graph.microsoft.com/v1.0/sites/{sites id}/drive/items/root:/{filepath}:/content
Here is the video link for more details
https://www.youtube.com/watch?v=EMBvuWbIPfE
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