Its probably better to use some form of server-side rendering.

You can put it in an iframe, but that’s bad for accessibility. You can put it in a regular frame, but that element is deprecated.

You could also make a small script that adds the contents of the file into a div

for a shotty quick hack you could just pop that sucker in an iframe

This is not possible* with native HTML.

You’ll want to either preprocess your website with a templating language (Nunjucks or Handlebars are probably the easiest), or enable server-side technology (PHP includes are probably the simple solution) to build your page navigation on request.

*There are some bad hacks on StackOverflow.