Not sure if it's a good fit for your use case, but I'm using gnome-network-displays to stream to my TV. It does Miracast and Chromecast. There's some lag, though. Not sure if that's my old TV or the protocol, but it's mainly good for streaming videos.
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Not really a solution specifically for a tiny screen like 8'' but you could search the web for point-to-point wireless HDMI extenders and see if that is something that could work for you.
F.e. https://products.digitus.com/en/AV-Media-Technology/AV-Extenders/Wireless/Wireless-HDMI-extender-set-50-m-1080p-60Hz.html
There's no dumb wireless display, that product category doesn't exist. Not that it wouldn't be possible; there's also "dumb" wifi-connectors around (you "dial" the IP via it's pins) but nobody really uses that in products, they all run a whole OS for wifi.
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