NLOpt library for rhel is not available in rosdep

Hi guys, Currently, we are working in a release for [Easynav_plugins](https://github.com/EasyNavigation/easynav_plugins). For a package we have as dependency [NLOpt](https://nlopt.readthedocs.io/en/latest/), which one is available for ubuntu and more. However, this library is not available for rhel. I was checking if it is possible to install from repos in Almalinux (distro used in Buildfarm) but there is not candidate. In this case, how it is the correct way to use a library/dependecy not available in repos using rosdep? or Is it possible to add nlopt tag for rhel using another method? Grettings!