TextMesh Pro Thicker Wider Outlines

Is there any way, using TextMesh Pro, to create thicker outlines?

Right now the thickest outline I can make is only about ~20% the width of the letter - so if the letter is 20px wide, the outline is max around 4 or 5px. I achieve this by setting the text's Face Dilate setting to 1, and then Outline Thickness to 1.

What I want is a THICK outline that the letter sits inside, so if the letter were 20px the outline would be around 100px. In the picture, the "story" text up top is created with TextMesh Pro. The huge "sa" below is a premade sprite showing how big I want the outline to be, relative to the letter.

Is there a way to achieve this? I know TextMesh Pro's outlines are created using the font asset creator atlas, hence why the letters have blurry edges in the atlas. Is there a way to make those blurry edges way bigger, so I can extend the outline much further? I wouldn't mind having a huge sized atlas if it meant I could get the effect I want.

Thanks!