I never saw a way to do that...
BUT, I tried here and works!

1 - Just create the emitter.

2 - In the Assembler Room set the display for the emitter to MESH.

3 - go to the frame number that you want to "bake"

4 - go to the Model Room with the emitter selected

5 - Inside the Model Room go to menu EDIT / Converte to Other Modeler and select Vertex Modeler

Back to the Assembler Roo the mesh will be there...

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