How can I change the Emscripten toolchain?

I want to use a newer version of Emscripten, because I need some new features to compile a static library. I already downloaded and compiled the UE version 4.20.2 from github, but there is no option for changing the directory to another HTML5 toolchain.

I know, there is a similar question ( Emscripten SDK 1.29.0 (higher version) not supported - Platform & Builds - Unreal Engine Forums ) but it’s already 3 years old and maybe things changed.