I have made a program that will let you do this easily, but the chapters need to be on separate files (you could split them with Sigil) and use my program to build the TOC.
Sigil can do it also, but you need to select each text and make sure it is a Heading 1, 2 or 3 depending on how you want your chapter nested. But I find that it is a long process, when you can do it in 1 minutes.
Look in my signature for the site.
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