Hi @Sameer K,
Re #Africa, what I had in mind was the many photos I see posted in Instagram or Facebook having the "#" placed in front of a word that might describe the photo, so the photo would come up when someone does a search for that word. Example: the photo with "#africa" attached to it would come up when someone does a search for "Africa," at least that's how I think it works. If I do that with an album I create, would I have that result? The next question is, where do I place that reference in the album, in the album name or in the name of a photo? I hope I'm not creating a puzzle for you.
Hey Richard! Lightroom, currently, does not have a search function available for Shared Albums. Here is slightly old conversation that can add more context to what you wish to do: https://adobe.ly/3UgRhLv
You can add relevant Keywords to your images before you share your album and the recipient viewers can sort based on your Keywords*.

I hope this helps!
Thanks!
Sameer K
(Type '@' and type my name to mention me when you reply)