/give @s mand_block
I'm sure that you must have a mand block now.Please set it on the ground.
Right click to open the GUI，then enter the following mand:
/tellraw @p {“text“:“\u00a7bHello Minecraft“}
Click the Done button to return the game.Take a lever out of your bag.Set it next the mand block.
Now let's pull the lever.The moment the lever is pulled， a line of light blue text appear surprisedly! Yes， as you looked， we can use the Unicode of § in JSON Text! Have you learned it?
If you want to learn about it more， please search “在原版中更改任意文字颜色“ in MCBBS.You will find a post by a great mand veteran in 2015.
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