Live Photos - Merge Multiple into a longer loop?

You can only loop a single live photo.

If you want to merge three photos in one longer loop, you would have to use the video parts of the live photos and combine them into a longer video. The video could be turned into a new live photo with Into Live or a similar app. If you transfer the Live Photos to a computer it is easy to extract the video componebts, but I am not sure how it can be done on an iPhone. There is probably an app for that, but I am using usually iMovie on my Mac to work with the video components of the live photos.