Hi Gen Mihashi,
UE 4.27 has added 16K alignment support in the 4.27+ LTS support branch with the following CL: https://github.com/EpicGames/UnrealEngine/commit/c79de00e3ba31b0b96220f8a0591a93d6770a3e3.
The dependency on libtry-alloc-lib.so has been removed. 16K aligned libc++_shared.so requires you migrate to NDK 27 or higher. We are however still awaiting a 16K alignment update to libplaycore.so to be released from Google.
Best regards.