Insert in Minecraft Chat?

I want to be able to copy and paste things in Minecraft Chat, and if so, how can I set it up?

You copy the text, open the chat in Minecraft and press "CTRL and V" at the same time.

But copying texts in Minecraft Chat is not possible to my knowledge.

You can mark texts with Shift (hold) + arrow keys (if you have entered them, e.g. In chat or on signs)

You can copy that with Ctrl + C

You can insert text with Ctrl + V

(I never tried it in Minecraft, but under macOS it would have to be CMD instead of Ctrl)

Copying is also possible