Just like Google Photos often presents you with photos on “This day 2-years ago” I thought it might be neat to have a plugin that just grabs the date for a journal page and queries GooglePhotos for your photos taken on that day and embeds them underneath your journal notes.
This idea of pulling in data you created on a specific idea could be extended to all your various apps with an api, even something like “Email sent on this day” or “websites visited” (from Google history) … with this you could have some system that would present you with a really full history of activity for a day across all the places you produce content and not just notes.