How do I alter the background color so that it fits inside the CircularPercentIndicator?

I'm trying to alter it so that the area within the Circle gets colored, but not the entire square as shown below. I used fillColor to change the background,

Here's what I have

Here's my goal

Stack(
  alignment: Alignment.center,
  children: <Widget>[
    Obx(
      () {
        if (settingsController
            .user.value.kicks.isNotEmpty) {
          var totalKicks = settingsController
              .user.value.kicks.length;
          var goalsArea = settingsController
              .user.value.kicks[1].kickArea;
          return CircularPercentIndicator(
            radius: 20.0,
            lineWidth: 2.0,
            percent: goalsArea / totalKicks,
            backgroundColor:
                Color.fromARGB(255, 0, 0, 0),
            progressColor:
                Color.fromARGB(255, 0, 0, 0),
            center: Text(
              ((goalsArea / totalKicks) * 100)
                      .toInt()
                      .toString() +
                  "%",
              style: TextStyle(
                color: Color.fromARGB(
                    255, 0, 0, 0),
              ),
            ),
          );
        } else {
          return CircularPercentIndicator(
            fillColor: Color.fromARGB(
                255, 206, 175, 138),
            radius: 20.0,
            lineWidth: 2.0,
            percent: 0,
            backgroundColor:
                Color.fromARGB(255, 0, 0, 0),
            progressColor:
                Color.fromARGB(255, 0, 0, 0),
            center: Text(
              "0%",
              style: TextStyle(
                color: Color.fromARGB(
                    255, 0, 0, 0),
              ),
            ),
          );
        }
      },
    ),
    Padding(
      padding: EdgeInsets.only(top: 40),
      child: Text(
        "Left 5m Channel",
        textAlign: TextAlign.center,
        style: TextStyle(
          fontWeight: FontWeight.bold,
          fontSize: 7,
          color: Colors.grey[400],
          background: Paint()
            ..strokeWidth = 8.5
            ..color =
                Color.fromARGB(255, 0, 0, 0)
            ..style = PaintingStyle.stroke,
        ),
      ),
    ),
  ],
),