I made a post very long ago about this.

It is also a wish I have seen many times.

Hopefully an IDEA post might help? You could create one.

In the meantime here is a small workaround:

In a text box with html button (on top) on  use this example as code to enter :

<ul>
<li style="color: black;"><span style="color: green;">one example</span></li>
<li style="color: red;"><span style="color: orange;">second one</span></li>
<li style="color: blue;"><span style="color: black;">and so on .... </span></li>
</ul>

found also an old testing page with multiple examples, it's a bit old but I think it still works.

https://andreweb.nl/x5_test/bullets_jb.html

good luck

There are numerous long-standing issues that Incomedia simply wishes to ignore.

Hello there!

I have set this post as an Idea, in this way we will bring the attention back on this need. 

Thanks! Kind regards.