How can I change block colors?

[aram-otf]

At first, I'm begginer in GNU/Linux world and I spent some days seeing the wiki to try to solve my doubt about a section of the full jsonc default file:
"break", { "type": "colors", "key": " ", "keyIcon": "", "symbol": "block", "paddingLeft": 0, "block": { "width": 3, "range": [ 0, 15 ] } } ]

I see some fastfetch configurations with different colors, how can I change it with some HEX colors to put a gradient for example. ANSI colors it's difficult and depth for me right now. Why type: "colors" recognize this 16 default colors?.

[CarterLi]

They are static texts. You may use custom module to create whatever you like

[aram-otf]

Perfect!, works excellent :) but I have to type with ANSI format likewise. Thanks a lot Carter <3
I will share the code and photo for others beginners like me hehe.
{ "type": "custom", "format": "\u001b[38;2;168;0;0m▀▄▀▄▀▄\u001b[38;2;168;0;0m▀▄▀▄▀▄\u001b[38;2;229;0;0m▀▄▀▄▀▄\u001b[38;2;229;0;0m▀▄▀▄▀▄\u001b[38;2;255;0;0m▀▄▀▄▀▄\u001b[38;2;255;0;0m▀▄▀▄▀▄\u001b[38;2;229;0;0m▀▄▀▄▀▄\u001b[38;2;229;0;0m▀▄▀▄▀▄\u001b[38;2;168;0;0m▀▄▀▄▀▄\u001b[38;2;168;0;0m▀▄▀▄▀▄" }