Can I use the repo to export posts in some channels?

[zydjohnHotmail]

Hello:
I have joined some Telegram channels, and some of them have thousands of group members, and even every member may post something only once in a few days, but I can see there are many many posts coming almost every minute.
I want to know how I can export those posts by the repo, I know I can do this job by hand in Telegram desktop.
But I want to have a program to do this.
Please advise,
Thanks,