Have a look at the following link in which I describe the 3 cables required.You will need all 3 as you have the USB-c ports.
https://discussions.apple.com/thread/251304950
The link refers to importing mini DV but it is the same procedure for Digital 8, which is what your camcorder is. The procedure is the same for both iMovie and FCPX.
You describe you cam' as being Hi8 but it is actually a Digital8 camcorder, ( and probably using Hi8 tapes ??? )
For others reading this Digital 8 can record onto Hi8 tapes. Hi8 tapes being originally developed for analog recording but subsequently being used for digital recording on Digital8 camcorders. Hi8 tapes and Digital8 tapes are the same apart from the printing on the packaging.
Make note of my comments regarding importing DV/(Digital8) onto newer operating systems and newer Macs. If you have access to an older Mac with older OS then you may have more success.
Also consider using your QuickTime player to Record your video as mentioned in the link.Same cables required
It can be a bit of a gamble to invest $80 or so on these cables only to find that you can't import your video.
It works for some people but not all.