You likely have it enabled by default, it's located in the view more or advanced settings on each specific wifi network, once enabled just forget network and reconnect, if that doesn't work, you can try enabling "WiFi non-persistent MAC randomisation". I'm not techie but that's what I did whilst on a camp site with a 30 minute trial, worked a beaut.

https://files.catbox.moe/zyrnw1.png

Can't speak for other devices, but on my Samsung it's a network level setting in the "view more" section of the wifi network configuration.