Improved wiggle for Jelly Effects

First, here are expressions for different wiggles:

Uniform scale wiggle:

w = wiggle(5,30); [w[0],w[0]]  

Separate axes wiggle:

Wiggle X Only: [wiggle(5,30)[0],value[1]]  
Wiggle Y Only: [value[0],wiggle(5,30)[1]]  

Wiggle X and Y separately:

[wiggle(5,30)[0],wiggle(20,30)[1]]

And here are expression for Jelly wiggle:

The main part is the "Wrap"-Effect

Use this expression for the Horizontal Distortion:

warp =effect("Warp")("Horizontal Distortion");
decay = .96;
end= 0;
duration = thisComp.frameDuration;
current = Math.round(time / duration);
amount = 10;
for (f = 1; f <= current; f++){
  difference = warp - end;
  amount = (amount - difference) * decay;
  warp+= amount;
}
warp

And this for the Vertical Distortion

warp =effect("Warp")("Vertical Distortion");
decay = .97;
end=0;
duration = thisComp.frameDuration;
current = Math.round(time / duration);
amount = 10;
for (f = 1; f <= current; f++){
  difference = warp - end;
  amount = (amount - difference) * decay;
  warp+= amount;
}
warp

by Ewan Smith on ae.tutsplus.com

For dynamic wobbly boxes there are free preset:

https://aescripts.com/wobblebox/