How to indent?

should i move to another plugin? I mean this plugin sounds does not support auto indentation.
Any one succeeded in this manner?

I think every time we press the [Tab] button in most IDEs, it becomes some [space] characters.
Just copy your source codes from your IDE to the crayon editor, then you will get the indents.
Check this out: https://widyagama.ac.id/informatika/komunitas/grup/pemrograman-web/forum/topic/tutorial-html-pendahuluan/#post-574

Is it the same for other same plugins? I mean is there no auto indentation and all indents should be specified beforehand by user (may be by coping from IDEs)?

Have you tried Netbeans?
You can press Alt+Shift+F to spruce up your codes.
There is also NppAutoIndent Plugin for Notepad++, but I haven’t tried it.

Any web based one?
For JS and HTML: https://jsbeautifier.org/

Expecting a WP plugin that could do it?
Yeah, I hope it too. I know it’s a hard work to do.