How to use API color variable in css file?

I'm getting a background-color from an API, variable name settings.brand_color. I want to use that variable in html element. I cant use style attribute becuase I'm using :before selector in my app. I want to pass that API variable in my css file and use it in my :before pseudo selector.

html

      <input
        id={languageLabel}
        type="radio"
        name="language-select"
        value={languageLabel}
        // defaultChecked={index === 0}
        onChange={() => {
          onLanguageChange(language, languageLabel);
        }}
        className="focus:ring-0  mr-5 my-18p default-style radio__input"
      />
      <div className="radio__radio"></div>

css

  width: 24px;
  height: 24px;
  background-color: #d8d8d8;
  border-radius: 50%;
  box-sizing: border-box;
  padding: 6px;
  margin-right: 20px;
  z-index: 1;
}

.radio__radio::after {
  content: "";
  width: 100%;
  height: 100%;
  display: block;
  background: #f28b46;
  border-radius: 50%;
  transform: scale(0);
  z-index: 9;
}

from How to use API color variable in css file?