Below is the modified Youtube Embed Code that I modified. This is the standard embed code from Youtube and I added the bold specifying when this link is to start and stop. Needs to be specified in seconds.

This will only play the 2nd chapter.

<iframe width="560" height="315" src="https://www.youtube.com/embed/wghCl_zxm4I?start=168&end=291" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>

Last chapter only