Lightmap Parameters Asset can not not be used for setting Baked GI resolution?

Is there reason why Lightmap Parameters Asset can not be used for setting Baked GI resolution (Unity - Manual: Lightmap Parameters Asset) ?It has this option for Realtime GI. I wanted to have 2 assets for 2 different set of objects. First would have default lightmap resolution for baked GI and other one would be 0.5 of default value. I know that i can use scale of lightmap on each of mesh renderers but it does not seems like elegant way of doing it. Do you have any tips for me how to handle it other way?

LightmapAsset