How to search within a Facebook group on Android (tablet and smartphone)

[CutesyUserName]

I can't see any way to search within a FB group (using a keyword) on my phone or tablet, the same way I can on my PC/laptop.

For example, I want to search one of my motorhome groups for a specific location and see posts within the group that mentions that location.

Any ideas?

Meant to add that I use Android (not iPhone).