$expand in TXDataClient.Get<>

When using TXDataClient.Get<Tinvoice>(3), how to have the following Get query with the expanded Blob Data?

How can I provide the $expand content?

Have you tried that? Any errors or issues?

The URL works, but how can I directly have the lazy blob field loaded (to avoid the second request in a case) when requesting it through

The client doesn't have an option for that yet, but you can always hook into OnSendingRequest event and manually add such query string to the request URL.