Can we bypass the initial lightmap.data asset ?

[JAMS49]

So I have checked out that I can manually bake the lightmap in the scene and then store it using the lightmap switcher , when I switch it to day and night , I have scene that it actually replace the lightmap.data asset of the empty day scene on the baked lightmap tab . are those lightmap.data asset which are assigned automatically when switching between day and night are alone enough to properly arrange the lightmaps of the scene? because I have a large scene , I baked it and it's lightmap.data asset (before i've stored the bake info into another scene) is sooo large , like 370 mb or something , which causes crash in mobile for being too big . can I get rid of it somehow?