scale
var target = thisComp.layer("INFLUENCER");
var radius = Math.max(1, target.effect("Radius")(1));
var near = target.effect("Near")(1);
var far = target.effect("Far")(1);
var d = length(position, target.transform.position);
var factor = ease(d, 0, radius, near, far);
value * factor / 100;

opacity
var target = thisComp.layer("INFLUENCER");
var radius = Math.max(1, target.effect("Radius")(1));
var d = length(transform.position, target.transform.position);
ease(d, 0, radius, 100, 30);

linear
var target = thisComp.layer("INFLUENCER");
var radius = Math.max(1, target.effect("Radius")(1));
var near = target.effect("Near")(1);
var far = target.effect("Far")(1);
var d = length(position, target.transform.position);
var factor = linear(d, 0, radius, near, far);
value * factor / 100;