underlined markdown doesn't work

[alixander]

style.bold and style.italic make sense to do nothing since markdown syntax controls those. But markdown has no syntax for underline. So style.underline should still work for markdown

underlined: |md
  Kubernetes Integrations
| {
  style.underline: true
}

[bo-ku-ra]

in Double Byte Character, bold is also not working.
https://play.d2lang.com/?l=&script=Ks1LSS3KycxLTbFSqMlN4VJQsCm18y5NSi3KSy1JLVbwzCtJTS9KLMnMzyu20S-1U1AAKcnMK8atCCQJVhYfDzc9Ph4q8rixCcrW0nrc2KSlBTEwye5xY5ONfpIdVw0XIAAA__8%3D&

underlined: |md
  <u>Kubernetes Integrations</u>  
  <ins>Kubernetes Integrations</ins>  
  __underline__  
  __あ__  
  **あ**  
  <b>あ</b>
|
|```

[alixander]

oh, hans characters bold not working