I don't know of a plug-in to integrate TEX/LaTEX equations at all, much less editing of them. However, you can download LyX, which is basically a word processor that can use TEX/LaTex equations and export them as PDFs that can then be linked in ID and would update when there are changes. It is a free solution.
MathType can also be used and is, to me, a low-cost solution and is what I have used in the past.
I have script to integrate MathType equations at all, but i want use TeX equation because TeX is more professional and has more options and looks nicer 🙂