Hi @Jillian Brown
You could use the new Plumsail Org Chart for SharePoint 2019. Now in addition to Classic pages, you can create org charts on Modern pages. As this is related to 3rd tool, it is not supported in Q&A, if you have further question, you could ask for help in other forum.
For more information, you could refer to:
https://medium.com/plumsail/org-chart-on-modern-pages-for-sharepoint-2019-on-premises-10991b774e24
https://plumsail.com/blog/org-chart-for-sharepoint-online-and-on-premises
https://plumsail.com/docs/orgchart/v1.x/installation/installation-2019-as-wsp.html
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