Export all text messages from an iPhone conversation.

I have about six months of text messages on my iPhone 7 Plus that I'd like to save or export. Originally, I made an attempt to scroll to earlier dates - however, that processes is extremely slow and therefore an unrealistic method for obtaining the entire conversation spanning six months.

So, is there an app or other method that can realistically export all of these messages without requiring the user to manually scroll months back to the origin of that conversation thread?