The transfer of chat from iPhone to Android arrives on WhatsApp, in the future it will also be possible the other way around.
For the moment the novelty is only compatible with the freshly presented Samsung Galaxy Z Fold3 and Z Flip3 phones, over the next few weeks it will arrive on other Samsung smartphones with Android 10 and more recent;
at a later time, unspecified, it will be made available to smartphones of other brands and the transfer in the other direction will also arrive.
To make the transfer you need a Lightning to USB-C cable, the two phones must be physically connected to each other.