An alternative, which you may already have considered, is to make use of Word's built-in headings (these can be customized to suit your formatting needs). The heading styles have different names across the world, but they all respond to the \o switch: For example, { TOC \o "1-4" \h } bases the TOC on styles using Heading 1 through Heading 4.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional