@anetteaustheim - Never implemented but this is feasible using API's. All the services, apps, modules data should be stored outside the lithium on third party server.
You will need to create an endpoint where you can use http.client context object to make a connection and sending or retrieving data from that server.
Here is the document https://freemarker-docs-portal.lithium.com/refer/contextObjects#httpClient
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