How to export private chat discussion

[icescream]

Hello,

I`a member of a forum relying on nodeBB and would like to save/export some chat discussions I had.
Is there a way to do that ? The discussion is very long and was done on several months so a simple copy paste is not possible and even load the full discussion is very very long.
At this time I didn't spent sufficient time to go back to make it fully loaded that's why I ask if there is a technical solution to do that in a smarter way
Thanks by advance