Provided script works with Chrome extension: Tampermonkey
It allows to assign group without visiting each channel settings page.
Tested only with structure which provided by ilookTv
Works in ottplayer.tv/playlist/edit/******
1: Copy all playlist.m3u8 content (will be used to determine channel url)
#EXTM3U
#EXTINF:0 tvg-rec="0",Channel title
#EXTGRP:news
http://channel.web/iptv/******/123/index.m3u8
2: Open Ottplayer playlist settings and paste into textarea content
3: Click 'Scan playlist' and 'Channel' which appeared after first click
4: Choose left side section where exist ungrouped channels. And wait until grouping buttons appear
5: After clicking them, channel will be assigned to selected group