• LF
  All diagram types support LF line endings.
• CRLF
  nomnoml doesn't support CRLF line endings.
  Parse error at line 2 column 35, expected "label" but got "[" skanaar/nomnoml#219 (comment)
• CR (very rare)
  D2, DBML, nomnoml, Pikchr, Structurizr doesn't support CR line endings.

How about replace line-endings to LF at kroki server by default?