WebOffice author provides in its ArcGIS toolbar a button for transferring the current ArcMap layer visibility settings to the table of content of WebOffice 10.7 SP1.
ArcMap toolbar for WebOffice author - Get table of contents
This button retrieves structure and visibility settings from the ArcMap data frame and copies it to the table of content of map collection in the currently opened WebOffice 10.7 SP1 project configuration.

Transferring structure and visibility settings of the currently opened ArcMap document
Note: Find more details about the table of content concept in chapter Table of Content.
Note: Find more details about the table of content configuration parameters in chapter Table of Content (TOC).