I've been playing with Send to Kindle Web. The easiest way to get what you seem to want was for me to do a Save to disc with the following template:
{series:| [|} {series_index:||]} {title} which gives [series #] title
or
{series:| |} {series_index:||] - {title} which gives series # - title
So basically save the books to a directory, drag and drop them onto Send to Kindle web and it seems to work happily.
For me, Send to Kindle web is available at
https://www.amazon.ca/sendtokindle. Just change the .ca to .com or whatever for your local Amazon site.