Define vim/NeoVim syntax and highlight settings for text written in toki pona.
Save tokipona.vim to [CONFIG]/syntax/tokipona.vim
(See the specific instructions for your editor and version for where to find the Config file.)
In your editor, enable syntax highlighting and then:
:set filetype=tokipona
I recommend also using /dev/urandom's Toki Pona vim spellcheck.