How can I access elements of cv::Vec4f by readable name?

I'm using the cv::HoughCircles() function from OpenCV to detect circles in an image. The function takes an output parameter of type cv::OutputArray to provide the results. Based on the example code I am using a std::vector<cv::Vec4f> as output parameter, so the code looks something like this:

std::vector<cv::Vec4f> found_circles;
cv::HoughCircles(gray_image, found_circles, cv::HOUGH_GRADIENT, 1, 1, 100, 100, 10, 20);

Each element in found_circles is now a cv::Vec4f containing x/y/radius/vote values. This basically works fine; but the code for accessing the details of the detected circles is not easily readable, because I have to access the members by index rather than by name.
For example, to sort the circles by radius:

std::sort(found_circles.begin(), found_circles.end(), [](const cv::Vec4f &c1, const cv::Vec4f &c2) -> bool {
  return c1[2] > c2[2];
});

It is not easy to see that c1[2] is the radius value.

Is there a way to access the circle details by name, so that the above code looks rather like this:

std::sort(found_circles.begin(), found_circles.end(), [](const cv::Vec4f &c1, const cv::Vec4f &c2) -> bool {
  return c1.radius > c2.radius;
});

For example, is there a way to access the cv::Vec4f elements with some aliased name? Or can I (with reasonable amount of code) create a custom data structure to pass as result parameter to cv::HoughCircles(), instead of std::vector<cv::Vec4f>?

I'm using OpenCV 4.5.3 and C++17.