If you want to allow your customers to choose between different text colors, you will need to create a text color question.
A text color question has to be applied on a text.
Creating a text color question
There are many ways to create a text color question.
From the text toolbar
Within the text toolbar, click on the colored circle, then click on + Color question.
From the text question
Open your text question.
At the bottom of the right panel, click on + Color question.
From the add new question menu
Click on the + button in the top left part of the screen.
Under Select input type, you can pick Thumbnail, Dropdown, Radio or Label.
Under Select a display type, pick Text color, then hit Create.
At the bottom of the right panel, under Display type, next to Apply on, click on + Text question and create a new text question or select an existing text question. Your text color will be applied on this text.
Adding color answers
Once your text color question is created, you can add color answers.
Open your text color question. Within the right side panel, next to Color answers, hit the + button.
From there, you can type in a Hex or RGB code, or select a using the color picker and hit Create.
Clicking on one of the colors in the customizer's question panel applies it on your text.