Is there a way to set metadata on a blob at the time of creation using current APIs without using Microsoft.Azure.Storage.Blob?

Important: There's a similar question which discusses using Microsoft.Azure.Storage.Blob which is deprecated. I am looking for a solution which does not rely on deprecated packages.

I am creating a blob in an Azure Storage Account using Azure.Storage.Blobs, and I would like to set metadata on that blob at the time of creation.

It's important that this is done at the same time; blob creation triggers an EventGrid event which in turn calls a function to perform an operation using that blob and its metadata. It would be problematic if the function is triggered before metadata is set.

Is there a way to do this using Azure.Storage.Blobs or similar?
(I do not want to use https://www.nuget.org/packages/Microsoft.Azure.Storage.Blob/).

Assuming your content is of type Stream, you can use UploadAsync(Stream, BlobUploadOptions, CancellationToken) method. You can set the metadata in Metadata property in BlobUploadOptions.

Your code could be something like:

var metadata = new Dictionary<string, string>
{
    {"key1", "value1"},
    {"key2", "value2"}
};

var blobUploadOptions = new BlobUploadOptions()
{
    Metadata = metadata
};

await blobClient.UploadAsync(content, blobUploadOptions);

Here's a more detailed example of the same: https://github.com/Azure/azure-sdk-for-net/blob/47ea075bca473fe6e9928ff9893fbaa8a552f3a5/sdk/storage/Azure.Storage.Blobs/samples/Sample03_Migrations.cs#L630.