I can report a Streamer. But I miss the report reason "Online Grooming". In addition, it should be possible to report not only streamers, but also users in the chat.
Twitch is full of adults who cavort in streams of minors and there demand ****** things from the children.
I know you have to be 13 to stream on Twitch. It is also correct that younger streamers are banned. But mostly only the young streamers are banned, and the groomers continue to mess around .

Most groomers ask about private social media. Most often Snapchat, Tiktok, Instagram.
Then it is not uncommon for the young streamers to receive instructions from the groomers via these accounts. You then hear a notification tone from the smartphone in the stream, the streamer looks for the message and a short time later the streamer makes some ****** poses or starts to undress.

These streamers are reported and of course also deleted from Twitch. But not the groomers.

I sometimes contacted streamers via Whisper. Many have confirmed and written to me that people request ****** things in private messages on Tiktok, Smartphone, or Discord servers. It seems there are Discord servers full of groomers and pedophiles.

Also, an upload function would be nice, to send a screenshot of the chat.

Often, there is a "bot" in the chats, called commanderroot. Here is the commanderroot website: https://twitch-tools.rootonline.de

You can sort all the channels with this tool. Be careful. You will see weird things on Twitch. You can also check who is following whom and who is being followed by whom.