It turns out someone wrote up an Idea about this exact issue several months ago: New Course Player - Descriptions for SCORM and xAPI (TinCan) | Community (docebo.com)
In the “Additional Details” tab for a SCORM file in Docebo, you can only fill out the 200-character limit short description and that is what displays in both the TOC and “Lesson Details” area of the new course player.
Is there any kind of workaround to putting a longer, more detailed description for SCORM packages in that “Lesson Details” area?