Hi @talknshare
This might be achievable moreso through modifying a theme. Please see our Theming guide for a sense of what is involved in this: PKP Theming Guide
Not quite the same issue, but the idea of modifying the table of contents is discussed here: Is it possible to have subsections in the Table of Contents? - and theming is discussed as the possible approach to doing this.
@NateWr or others may be able to weigh in further on the extent to which this might be achievable through theming.
Roger
PKP staff