There are "workaround" solutions using things like DisplayLink-equipped hubs or adapters – but none give you extra first-class hardware video outputs.
DisplayLink (and similar technologies) work by
- Having you install a special driver on your Mac. It creates virtual displays in software, and periodically sends updates over something like USB-C (USB).
- Having you use an external "stunt box" (hub, adapter) that has a special chip set to decode the compressed updates that the driver sends out.
Screen refresh may not be as consistent as what you would get with real hardware video output, and vendors of these types of products will sometimes say that the products are not meant for frequently-changing content, or for video games.
If new versions of macOS break the special driver, you will be dependent on third-party vendors to update that driver before displays connected in that way will work again.
Also, if you're trying to play DRM-hobbled content, it might not play on monitors connected in this way, or might not play at all if ANY monitors are connected in this way.