Print Text to Screen would let you assign any color to the log you want to show, to show onto a log screen which is usually best for letting other players use their in-game camera to share error logs or room history, etc.
But if you’re still wanting to use Log String or Log Error just for log keeping, or to keep using Log String to spit all errors onto a Log Screen etc, you could do a trick like this.
In which the Log String chip is configured to the color, and the chip is recolored to know what color it was configured to, then you just send the string and pick an int for the color!