Custom fields in attachments

[ericdes]

Would there be a way to add custom fields in a document's attachment? 
I'm thinking about something like this:

{
  "_id":"html_page_with_images",
  "_attachments":
  {
    "image1.jpg":
    {
      "content_type":...,
      "data":....,
      "alt":"Image #1",               <== Custom field
      "title":"Title of the image",   <== Custom field
    }
  }
}
Eric Desgranges
e...@vcardprocessor.com