You can only change team prefix and suffixes to "true" or "false" which shows next to your name
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Something like this would work!
/team modify pembe prefix {"text":"pembe ","color":"gray","bold":"true"}Though if you want more than one color (or bolded text) add "[ ]" around the "{ }" Like this.
/team modify pembe prefix [{"text":"pem","color":"red","bold":"true"},{"text":"be ","color":"green","bold":"true"}]you can add as many as you want! e.x. [{_____},{__},{__},{___}] Simple!
See MC-123807. You need to put quotes between it. So,
would do the trick.