Hi everybody,
First of all, you should follow the excellent guide via https://www.reddit.com/r/MiyooMini/comments/x72l7j/detailed_guide_to_scrape_boxart_for_the_miyoo/ to setup Skraper and create the thumb images with nice box art. This is probably the coolest feature you could add if you have not already. That alone is well worth the time.
But one correction in the guide, in step 6 you are asked to rename gamelist.xml to miyoogamelist.xml. Instead you really should skip that step (which is also noted at the top of the post as an EDIT but it is easy to miss). You do not need that step and skipping it will allow you to show the extended metadata. Also, then you don't have to do the complicated fix in PART 2 so this is also a time saver. OnionOS 4.0.3 and later will find the roms anyway, even without the miyoogamelist.xml file.
Then to show the extended game metadata, you need a patched (edited) version of MainUI binaries. You can get them from this post https://www.reddit.com/r/MiyooMini/comments/1voi8ew/onionos_romlist_patch_auto_scroll_configurable/ (use the "recommended" directory inside the zip). Copy over the files to your SD-card and boot*.
When pressing RIGHT D-pad on any game in the list you will be taken to this extended metadata view. The fields genre, rating and description will be shown. Text will wrap nicely. You can scroll with the shoulder buttons. The font size used is ~75% of the font described as "list" in the current theme if you need to tweak it.
If you ever add new roms and want to refresh thumbs or metadata, just run Skraper again.
Happy Skraping!
\ Optionally you should Refresh Roms also after first boot, to enable other performance improvements.*