Option to fill in variables in mirrorlist

Is there an option to fill in the variables that the mirrorlist returns? We have Spacewalk running and the mirrorlist returns a list of URL's that have the variable `$basearch` in them. Spacewalk can't resolve or change that variable.

It would be nice to have the option to generate that URL without those variables so it returns static URL's.

### Now
The URL https://mirrors.almalinux.org/mirrorlist/8/baseos returns the following:
```
http://mirror.nl.altushost.com/almalinux/8/BaseOS/$basearch/os/
http://mirror.nforce.com/pub/linux/almalinux/8/BaseOS/$basearch/os/
http://mirror.previder.nl/almalinux/8/BaseOS/$basearch/os/
http://mirrors.evoluso.com/almalinux/8/BaseOS/$basearch/os/
http://mirror.wd6.net/almalinux/8/BaseOS/$basearch/os/
http://almalinux.mirror.wearetriple.com/8/BaseOS/$basearch/os/
http://mirror.mijn.host/almalinux/8/BaseOS/$basearch/os/
http://mirrors.mvps.net/almalinux/8/BaseOS/$basearch/os/
http://almalinux.mirror.liteserver.nl/8/BaseOS/$basearch/os/
http://mirror.almalinux.ams01.readydedis.com/almalinux/8/BaseOS/$basearch/os/
```

### Suggestion
Adding a parameter to the URL will fill in those variables, simething like `?basearch=x86_64`
The following URL would return the below URL's: https://mirrors.almalinux.org/mirrorlist/8/baseos?basearch=x86_64
```
http://mirror.nl.altushost.com/almalinux/8/BaseOS/x86_64/os/
http://mirror.nforce.com/pub/linux/almalinux/8/BaseOS/x86_64/os/
http://mirror.previder.nl/almalinux/8/BaseOS/x86_64/os/
http://mirrors.evoluso.com/almalinux/8/BaseOS/x86_64/os/
http://mirror.wd6.net/almalinux/8/BaseOS/x86_64/os/
http://almalinux.mirror.wearetriple.com/8/BaseOS/x86_64/os/
http://mirror.mijn.host/almalinux/8/BaseOS/x86_64/os/
http://mirrors.mvps.net/almalinux/8/BaseOS/x86_64/os/
http://almalinux.mirror.liteserver.nl/8/BaseOS/x86_64/os/
http://mirror.almalinux.ams01.readydedis.com/almalinux/8/BaseOS/x86_64/os/
```