GitHub-flavored Markdown does not use C-style escapes for escaping backticks inside spans. Instead, GFM uses double, significant whitespaced, backticks.
Two backticks, then a space, then a backtick, then a space, then two more backticks:
`` ` ``
produces:
`
@patbl
To display triple backticks in a fenced code block, wrap them inside quadruple backticks ````.
https://docs.github.com/en/get-started/writing-on-github/working-with-advanced-formatting/creating-and-highlighting-code-blocks