It's already in place, to an extent — everything you see in the trailer was built using it, and it already saves levels out to external files for easy sharing — but it still needs a lot of work before we can call it fully - featured. (kickstarter.com)
Note that generally eBook readers expect one file to contain the full data while HTML uses many external files such as CSS file, Image files, other HTML pages, etc.. (wiki.mobileread.com)
Make sure that external file Dividends.csv has information about dividends paid for symbols you require. (PortfolioSlicer.com)