Running mathjax command everytime Obsidian Starts

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

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)

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