The emitter is huge - 22 mm diameter compared to 3mm square for an SST-90 and I think 1.8mm square for an XM-L. That means you will need a huge aspheric if you want it to focus well. Huge like >200mm.
These emitters are not intended to be focused. They are for area illumination. For 4K lumens focused you are much better off looking at the CSM-360 or similar parts from Luminus. Their emitters will be around 6mm square. Probably just a bit more as there's gaps between the 4x3mm dice.



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