script to create multiple font text in source text property

I'm looking for a script that can use multiple fonts in one text object. Faux bold is not an option.

I tried to tackle this first with linking one text's source text to another text layer. I see that source text property doesn't carry over formatting, and even the

ref.style.setText(ref.value);

method only brings over the styling of the first letter.

On the other hand, the fact After Effects itself somehow manages to keep text with multiple font styles in one object gives me reason to believe that there is a solution.

Does anyone have any ideas?