You can add a TC field (table of contents entry field) on the page in question by pressing Alt+Shift+O. The field is formatted as hidden and won't be visible unless you display nonprinting marks (which you can do by clicking the ¶ button on the Home tab).

After you have added a TC field, add the \f switch to the table of contents field and press F9 to update it. You can use Alt+F9 to toggle field display.

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Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional