setting RGBA values in inline styles

To set a color in a React inline style to an RGBA value I can at least use string interpolation in ES6:

<div style={{color: `rgba(${r}, ${g}, ${b}, ${a})`}}>test</div

Does React support objects instead of a string here? Something similar to it supporting numbers where pixel units are assumed for styles like width etc. For example:

<div style={{color: {r, g, b, a}}}>test</div