is it possible for the Google Photos app to show slow motion controls on any video?

Basically I am wondering if there is a way to modify video file metadata or something to have the Google Photos app show the show motion controls on videos that weren't recorded in slow motion.

I think this should be possible because the way Google Photos deals with slow motion files, it plays the slow motion selected section in 1x and speeds up the non selected section.

I have a ZTE Axon 7 which records in slow motion. The slow motion is recorded at various frame rates, however the resulting file is always 25fps.

Meaning if I record 5 seconds on 4x, I get a 20 second 25 fps file, 8x I get a 40 second 25 fps file etc.

If I copy this file to a PC it appears to be a normal 25 fps video file, but something in it is telling the Google Photos app that it was recorded in slow motion and that the app should display the special show motion slider controls. I'm thinking there's some metadata in the file giving it this info, what is the data, or 'slow motion flag', and can it be inserted into a different video file?

I have a slow motion recorded video file I can upload for somebody to inspect for flags or metadata, but I am too new to post a link.
I am also wondering if you copy the unedited slow motion .mp4 out of one phone into a different phone if you still get the slow motion sliders in Google Photos on the destination phone.

How can I modify a video file not recorded in slow motion to show the slow motion controls in the Google Photos app? How does the Photos app 'know' a file is 'slow motion' (when really it appears to be just a normal 25fps video file)?

Thanks!

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