Exporting Specific iMessage Conversations?

[Wang, Hilary]

Hello All, 

I'm searching for recommendations for workflows and tools to export specific iMessage conversations including attachments (photos etc). Ideally, we'd like to avoid using a third-party tool, but curious if anyone has used iMazing. Or other terminal commands (ReagentX/imessage-exporter)

The iMessage chats need to be exported from an actively used iPhone, there will be access to a Mac, but the iMessage may not be fully backed up there. 

Thanks in advance!

Hilary