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
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