Group message history didn't transfer from Android

Hello,

I purchased an iPhone after having previously used Android. I used the 'Move to iOS' app and it looks like my contacts, apps, etc all ported successfully. The only issue is that group message history didn't seem to copy over to iMessage from Google Messenger. Any message threads with just one person all copied and have the history, but the group chats didn't. I'm receiving new messages from group threads just fine, but there's no history. The Move to iOS app seems to be just for initial phone setup, is there any way to transfer over the rest of my message history?

Thanks,

Bart