How to Create Responsive Lower Thirds

CODE FOR WIDTH:
targetLayer = thisComp.layer("Layer Name");

w = targetLayer.sourceRectAtTime().width;
s = targetLayer.transform.scale[0];
p = (s - 100)* .01;
finalSize = w + p * w;

finalSize

CODE FOR HEIGHT:
targetLayer = thisComp.layer("Layer Name");

h = targetLayer.sourceRectAtTime().height;
s = targetLayer.transform.scale[1];
p = (s - 100)* .01;
finalSize = w + p * h;

finalSize

Creating responsible lower thirds using method above:

PDF here

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https://ukramedia.com/how-to-get-correct-text-layer-size-in-after-effects/