There are a few ways. If the assets already sit on S3 you could easily write a script to go file by file to create via the API/SDK as you mentioned. The other way is if files do not s3 on s3 you can automate a workflow that will call your create job request when object uploads are complete. We have a blog post that goes over some ways to make an watchfolder style workflow 
Please keep in mind about our API limits as to not be throttled when creating your request. 
Thank you for your reply. I will implement it with Lamda.
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