You can do this by writing your own shortcode. The "days in a row" part can be tricky since you'll have to figure out how to count consecutive days as defined by your requirement. Does consecutive days include weekends and holidays or are they skipped and the focus is business days? It's tricky. Anyway, here's an article that describes how to create a shortcode to count entries. There's no date math in this shortcode, you'll have to figure that part out yourself. https://formidable-masterminds.com/count-entries-shortcode/