Hi Elaine, if you’re using the rich text field for a table of contents, then you can put whatever you want in it. However it’s static content… if you create a FAQ, you’d add a line to your ToC and link to that FAQ’s #hash id.
If you want to automate that to handle CMS-based FAQs, you probably want to get creative and have another collection list just below(?) your ToC, which is styled similarly and links your FAQs there. This would look contiguous and can be setup to work seamlessly.