Running mathjax command everytime Obsidian Starts

[QinfiNity]

My aim is to use several custom MathJax commands built using \newcommand{}{} as shown in the answer provided in this link :

Import custom Latex commands to notes

Hi all, I am curious how to import custom Latex commands to obsidian notes. Since I have written some commands in Latex, and I would like to use/call them in the obsidian notes. However, I do not know how to do it. For now, we can rescope the discussion of the latex commands to only use in the math equation. Thanks.

Now pasting those \newcommands in every file that I am using is a bit tedious. Is there any way (without using community plugins) that I am able to run a set of MathJax commands just as obsidian starts? (and having the \newcommans preserved for entire session)