javascript - Push attributes to GeoJSON in Leaflet

I am trying to add attributes to a layer. I have a select function that finds all points within 10 miles of a feature. If the point is within the radius distance I add it to an array and make another "Selected Set" out of it for a map and report. However they now want to sort the selected point based on distance from. How do I push this vale to the selected point?

var selPts = [];
    function SelectPoints(lat,lon){
        var dist = 10; //Get Radius distance
        xy = [lat,lon];  //center point of circle

        var theRadius = dist * 1609.34  //1609.34 meters in a mile 

        selPts.length =0;  //Reset the array if selecting new points

        sites.eachLayer(function (layer) {
            // Lat, long of current point as it loops through.
            layer_lat_long = layer.getLatLng();

            // Distance from our marker To current point in meters
            distance_from_centerPoint = layer_lat_long.distanceTo(xy);


            // See if pt is within radius, add the to array
            if (distance_from_centerPoint <= theRadius) {
                 selPts.push(layer.feature);  
                 // how do I push distance_from_centerPoint into the feature properties?
            }
        });

Answer

Since I wanted to just add a distance field (dist), and I had the feature in my loop, I just added "layer.feature.properties.dist = my Distance Value" then when I pushed the layer.feature it went along.

    sites.eachLayer(function (layer) {

        // Lat, long of current point as it loops through.
        layer_lat_long = layer.getLatLng();

        // Distance from our marker To current point in meters
        distance_from_centerPoint = layer_lat_long.distanceTo(xy);

        // See if pt is within radius, add the to array
        if (distance_from_centerPoint <= theRadius) {

           layer.feature.properties.dist = (distance_from_centerPoint / 1609.34); //meters to miles


             selPts.push(layer.feature);  

        }
    });