@Gökhan Kurt I have noticed a feedback request already here that is similar with your ask: https://feedback.azure.com/forums/916621-azure-digital-twins/suggestions/41929507-support-for-message-enrichments-on-twin-update-eve
Please vote for it if it matches what you are trying to achieve.
I have also found that the digital twins are stored by default as a flat hierarchy in Time Series Insights, but they can be enriched with model information and a multi-level hierarchy for organization: https://learn.microsoft.com/en-us/azure/digital-twins/how-to-integrate-time-series-insights
Let me know your feedback about the above. In the meantime I am connecting with Product Team to check any other alternatives like the one you suggested.
Thanks!