Source: WABetaInfo
WhatsApp already lets some Samsung and Google Pixel users migrate their chat histories from iOS to their devices. But now, the company is reportedly working on an option to import your Android chat history to iOS. WABetaInfo spotted the feature in the latest WhatsApp beta version 22.274 for iOS, which the publication pointed out corroborates a discovery made in the 2.21.20.11 Android beta version. It'll reportedly use the Move to iOS app to transfer the chats.
Based on the screenshots from WABetaInfo, it looks like you'll need to allow the app to start the transfer process. And you'll need to keep your phone unlocked with the app open to begin the transfer. It isn't clear when WhatsApp plans to roll this option out. But if it's testing it out, we might see it sooner than later.