In iOS 14 (and versions back to iOS 12), you can draw or type on any photo you take when using the Photos app thanks to the Markup tool.
Launch Photos, open a pic, and click the three-slider icon that opens up the editing options. From there, click the three-dot icon in a circle and choose “Markup.”
(This how-to is based on my experiences and info on Apple’s support pages — where the images sometimes come from.)
