Simplified Vim config or remap?

I'm really used to a few keybindings that just remap a few things

:imap jj <Esc>
:nmap ; :

I tend to spam these in my normal workflow so it'd be nice to just set a config somewhere or allow remapping. So far i just type these two commands at the start of each problem but seems like a reasonable quality of life improvement for us Vimmers (Emacs could have something similar).

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