I don't think that's possible. To send out a dashboard on a schedule, it has to be through a PDF. You can send a report out on a schedule with an inline table in the email body, however.
In reports, how about sending a chart in the email body. Is that possible ? Dont want it as attachment.
The only inline options available are 'Table, Raw, CSV', so i don't think it's possible for including a chart in the email body. That'd be a great feature request though.
is there any workaround available now to do what is asked in the question ?