Apache HTTP Server Installation Guide 2.4.37
2.2.1. Using mod_jk,mod_cluster, mod_rt, and mod_bmx with RHEL 8

If you want to use these modules, create or modify configuration file to add LoadModule command, for example:

LoadModule jk_module /opt/rh/jbcs/root/usr/lib64/httpd/modules/mod_jk.so

As far as I checked the latest mod_jk package jbcs-httpd24-mod_jk-ap24-1.2.48-1.redhat_1.el8jbcs.x86_64, the correct mod_jk.so path is as below:

# rpm -ql jbcs-httpd24-mod_jk-ap24-1.2.48-1.redhat_1.el8jbcs.x86_64
/opt/rh/jbcs-httpd24/root/usr/lib64/httpd/modules/mod_jk.so