Conditionally show text and link to a merged chm

RH Version: 2015 (build 12.0.3.428)

OS: Windows 10, x64

So, I know when you merge a chm into another chm, it adds a link in the Contents tab if that chm resides in the same folder.

For example, here we're merging an Inform.chm into our Inspect.chm help. Inform.chm is tied to a plugin type component in our application and isn't always installed on every users system.

If the chms are in the same folder, like this:

Then in the chm, it adds in the tab:

This is great, but Is there a way to do the same thing with text and links in an htm page? I want to conditionally add the text "Inform tab" between the "Measure tab" and "Report tab" text so to the user it appears seamlessly in the list of links: 

Has anyone done something like this? Like via scripting somehow?