C# how to map Multi Part Column names to class properties?

I have the following Model class:

public class Invoice
{
    public string Id{ get; set; }
    public string BlobInfoContentType { get; set; }
}

Now the issue is that in my database, the content columns has this name:

BlobInfo.ContentType

This is how I use it with Dapper:

                using (SqlConnection connection = new SqlConnection(db))
                {
                    const string UserQuery = @"
SELECT Id, BlobInfo.ContentType
FROM Invoice 
WHERE Id = @Id
";

                    await connection.OpenAsync();

                    var invoice = await connection
                        .QuerySingleOrDefaultAsync<Invoice>
                        (
                            UserQuery,
                            request
                        );

                }

It fails with:

Failed with exception.System.Data.SqlClient.SqlException (0x80131904): The multi-part identifier could not be bound 

I've tried various forms of annotations on my model class but they don't seem to have any effect. I also tried using "AS, like this BlobInfo.ContentType as BlobInfoContentType but it did not work either.

How to map Multi Part Column names to class properties?