Tellraw how?

I have a realm in Minecraft and I want to use tellraw to write in the chat that I left but I'm still inside but don't quite know what to enter. Can someone help me?

Maybe you can produce the desired text with this Tellraw generator:

https://minecraftjson.com/

Thanks, I'll have a look

/ tellraw @a {"text": "Test", "color": "dark_purple"}

or a generator like that

https://minecraft.tools/de/tellraw.php

I think

https://minecraft.tools/de/tellraw.php den

Can you write me that as if the message comes from the server and it should be in there IQKrieger031 has left the game could you write me how I have to type it in?

/ tellraw @a {"text": "IQKrieger031 has left the game", "color": "yellow"}