But after closing app, fans will go back to default speed.
You would need to make sysmodule that will constantly run in background, measure temperatures and adjust fan speed.
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System settings doesn't work like that.
https://switchbrew.org/wiki/System_Settings#tc
Only what you can adjust with system settings is tskin_rate_table_console and tskin_rate_table_handheld for fans, but this is limited.