As reported today, there is a vulnerability when using Unicode characters that allows a malicious actor to disguise source code in the eyes of the programmer, by using Unicode BIDI characters. This was published today as the “Trojan Source” bug affecting virtually all development environments and compilers.
The idea of the LTS is to not provide new features but only fix critical bugs. So this feature will not be part of 8.9 LTS, no. For people that want the latest features, we recommend using the latest version instead of LTS.