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There is a rockchip phone https://pine64.org/devices/pinephone_pro/
If anyone can do it'd be a state-industry like China trying to soften the market while giving themselves options outside of US/CIAwan chips, but yea I'm sure there are plenty of asterisks... and opensource design is only one part in the manufacturing the physical thing
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Some of the rockchip SoCs are open source. I've tested a couple including compiling the firmware, and it's not too bad.
But I frankly have no idea how to test it for backdoors. Could be a honeypot.