Answer
No — this capability genuinely isn't available in Aurena yet, and it's a bigger undertaking than a client-side gap alone: supporting it properly requires changes to the underlying OData layer as well as the Aurena client itself, not just a UI addition. This has been acknowledged as a recognized capability gap that IFS prioritizes based on overall product-team roadmap needs rather than something with a quick client-side workaround — check current release notes if aggregate/group-by support in Saved Searches is a hard requirement, since this is an area under active consideration.