Suppose there is a set of texts ready to be parsed through commonmarkjs. A few among them have markdown and most of them are plain non-markdown text, which doesn't need conversion. Is there any way we could avoid converting plain non-markdown text to HTML and only convert the markdown texts? I have given a few examples below:

• urls, e.g. My favourite search engine is [Duck Duck Go](https://duckduckgo.com).
• unordered lists, e.g. - First item
• bold, e.g. I just love **bold text**.
• italic, e.g. Italicized text is the *cat's meow*.
• headings, e.g. ## Heading level 2

These set of texts should be converted to HTML

• My favourite search engine is Duck Duck Go
• First item
• I just love bold text
• Italicized text is the cat's meow.
• Heading level 2

These set of texts should not be converted to HTML (as they don't have markdown)