One of these:
Cheap enough that it's worth a shot ;-) (wouldn't be able to tell you where to find one in Brazil though!)
So you'd plug:
I am a little skeptical this will work though, it depends how exactly how they're handling the video over USB-C.
If the loupe is a USB-C host device and is sending actual HDMI over the cable, that setup should work.
However the fact it's got a male connector on the loupe, and also that they state it's USB 2.0 makes me think that actually it's using the older USB Video Class specification - basically it's a webcam, and isn't sending HDMI down the cable at all so no video will come out of the HDMI port on the adapter.
Before buying anything, try plugging it directly into a computer and see if you can see it as a webcam in Skype/OBS or whatever. If you can, it's USB video and this adapter configuration isn't going to work.
(But then instead you could then hook it up to a computer and broadcast a live feed over a network instead, so there's still a potential solution there.)