Plug "ncm2/ncm2-match-highlight"
let g:ncm2#match_highlight = 'bold'
let g:ncm2#match_highlight = 'sans-serif'
let g:ncm2#match_highlight = 'sans-serif-bold'
let g:ncm2#match_highlight = 'mono-space'
" default
let g:ncm2#match_highlight = 'double-struck'