Pop In object (@ 17s)

I'm fairly new to Expressions, I'm trying to attain this effect with expressions. I tried using the inertial bounce code on the net

n = 0;
if (numKeys > 0){
n = nearestKey(time).index;
if (key(n).time > time){
if (n == 0){
t = 0;
t = time - key(n).time;

if (n > 0 && t < 1){
v = velocityAtTime(key(n).time - thisComp.frameDuration/10);
amp = .05;
freq = 4.0;
decay = 8.0;
value + v*amp*Math.sin(freq*t*2*Math.PI)/Math.exp(decay*t);

To make this generic, I acquired the desired result by creating a null object with a scale value of 100, applied the above code to the null and added s=linear(thisComp.layer("Null 8").transform.scale[0],0,150, 0,desiredScale); [s,s] to the required object's scale. Though this works decently, this is such a pain to do for every object (I have a lot of objects for which I want to apply this effect). Is there a simpler way?

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