Explain how or add ability to remap "c :"

Is your feature request related to a problem? Please describe.

I'm trying to create a macro c: that works like ci" but instead of changing the "text in quotes" it changes the text between : and;.

.someClass {
  margin-top: 1000rem;
  //         ^------^ this area
}

Describe the solution you'd like

I'm not sure the best way to do this.

Describe alternatives you've considered

I've tried using "vim.normalModeKeyBindings" and "vim.operatorPendingModeKeyBindings" but either I couldn't figure out the correct sequence in "before" to do it, so such a setting seems to have no effect

	"vim.normalModeKeyBindings": [
		{
			"before": ["c", ":"],
			"after": ["F", ":", "f", ":", "l", "c", "t", ";", " "]
		}
	]

I also tried setting a keybinding as noted in the readme

	{
		"key": "c shift+;",
		"command": "vim.remap",
		"when": "inputFocus && vim.mode == 'Normal'",
		"args": {
			"after": ["F", ":", "f", ":", "l", "c", "t", ";", " "]
		}
	}

Which works but completely breaks other sequences starting with c such as ciw.

Start with the README remap example and the vim.normalModeKeyBindings and vim.operatorPendingModeKeyBindings settings described in the issue. Determine how a c: mapping can coexist with sequences such as ciw, then verify that the requested change or explanation supports changing text between : and ; without breaking existing c mappings.