WA chats can be transferred from within the app. Not sure whether it makes a difference that the source is an iPhone (I seem to remember some threads here in the forum), but you could try like this
EDIT
Sorry, it isn’t as simple as that – see WhatsApp FAQ How to move chats from an iPhone to an Android device
Searching a bit in the forum and on the web showed various issues and possible solutions but this method involving QR code seems to be relatively recent. IIUC you’d have to do a factory reset though. And I think the mention of SmartSwitch is a leftover from an earlier version …
Good luck!