Thanks for reaching out to Lucid support. We do not have a feature to do exactly what you are describing, but there are a few ways you could make this happen in Lucidchart.
You could add the additional committee member information into notes associated with the org chart shapes, as shown here:
You could also create additional pages in your diagram containing the committee member information and use hotspots to link the org chart shapes to these pages.
Hope this helps!