public access to private blob storage files

I am trying to share a "dynamic/one" time URL (like a SAS URL) for some files in a private storage (blob storage) to the public users.

So I am looking for a solution which maybe it works like a proxy or a hub between my private network and the public user to just give the end users what they need securely, based on their request, out of the private blob storage.

For example in public blob when the access is set to anonymous access to blob and container you can give a file URL to the user and its usable for them. In private network you can create a SAS URL but you can see it just in the same private network. But how we can combine these two way (security of the private network+one time URL+public access to the files)?