As title indicates, I mainly use hackMD as a math notebook, and hence I use lots of LaTex to edit my context. However, I wanted to add some new commands as in overleaf but I failed. So I am curious that is it possible to define personal commands as in overleaf.

As title indicates, I mainly use hackMD as a math notebook, and hence I use lots of LaTex to edit my context. However, I wanted to add some new command as in overleaf but I failed.