LightMapGIData. I can't find the equivalent to the "energy" property that was available in Godot 3

[sharp pike]

Hi all. I have a quick question for anyone willing to help. If I've asked this in the wrong thread please let me know and I will ask it again in the correct place. The question is about LightmapGI. In Godot 3 lightmap data had an energy property. You could vary this between 0.0 and 1.0 to fade baked lights in and out in real time. This was extremely useful for things like lights that are flickering or that need dimming etc. I can't find an equivalent on the LightmapGI or LightmapGIData. Has this functionality been lost or am I simply being a banana and looking in the wrong place? Many thanks in advance. Any help would be greatly appreciated.

[warped canyon]

In the official docs of LightmapGI, it says this:

Procedural generation: Lightmap baking functionality is only available in the editor. This means LightmapGI is not suited to procedurally generated or user-built levels. For procedurally generated or user-built levels, use VoxelGI or SDFGI instead (see Environment.sdfgi_enabled).

You can check VoxelGI here & Using VoxelGI.
Or check all the Global illumination tutorials.