I was looking for the same. As you already mentioned, you can chance this by adding this code to your custom style. (this is for the 2 balloons)

"quote" LeonidS- Yes, it's possible to do via CSS. In the Studio->[Your template name]->Styles->Custom Styles area you need to add somth like:

.bx-artificer .col-blue2 {--tw-text-opacity: 1; color: rgb(168 85 247/var(--tw-text-opacity));

}

To chance this color, chance the rgb numbers 2 your need. I.e. 168 85 247 (purple) -> 17 166 132 (blue).

For those who don't know; you can find the rgb color by using a color picker installed in you browser. Or in your image editor.

If someone knows a easier way, please lets us know 😀