如何通过语法将Ruby Sorbet签名突出显示为不强调的 comments

Normally, Sorbet signatures are syntax highlighted as normal Ruby:

然而，我想在视觉上淡化嘈杂的签名，也许可以通过将它们突出显示为 comments .

以下是~/.vim/after/syntax/ruby.vim的部分内容:

" adapted from: https://github.com/zackhsi/sorbet.vim/blob/master/syntax/ruby.vim
syntax region SigBlock matchgroup=SigBlockDelimiter start="{" end="}" contained transparent
syntax region SigBlock matchgroup=SigBlockDelimiter start="\<do\>" end="\<end\>" contained transparent

" Prevent sorbet elements from being contained by vim-ruby elements.
syntax cluster rubyNotTop add=SigBlock

syntax match Sig "\<sig\>" nextgroup=SigBlock skipwhite

" hi def link SigBlockDelimiter rubyDefine

" Match vim-ruby:
" https://github.com/vim-ruby/vim-ruby/commit/19c19a54583c3e7c07dce18b844ae104695c41d7.
syntax match rubyMagicComment "\c\%<10l#\s*\zs\%(typed\):" contained nextgroup=rubyBoolean skipwhite

" de-emphasize Sorbet sig
highlight default link Sig               Comment
highlight default link SigBlockDelimiter Comment

Like so:

如何获取签名块内部的代码也突出显示为Comment？

作为参考，我使用sheerun/vim-polyglot(即vim-ruby/vim-ruby)和nanotech/jellybeans.vim.此外，更理想的是保留 colored颜色 ，但只是"降低对比度"，这是VSCode的byesig扩展，但这可能需要定义很多新 colored颜色 和语法规则？