Lightmaps should still work.
Make sure you have the following settings:
Allow Static Lighting
is set to Enabled (in Project Settings)Dynamic Global Illumination Method
set toNone
(in the Project Settings and/or post process volumes)Force No Precomputed Lighting
set to Disabled (in the World Settings) (If “Force No Precomputed Lighting” is greyed out and you can’t change it, that most likely means you are using a World Partition level, which doesn’t support static lighting.)