Feature description

As asked several time on the github, there is no documentation for tweaking LScenes.
With the right keywords, one can find that LScene().scene[OldAxis] allows to get access to some axis attributes that one can modify after the LScene block was initiated.
I would like to theme a LScene() for a recipe I am making, say axis name by default, its color and the ticks etc, but there is no documentation to do so.
The documentation gives in the Theme section :
Theming block objects

Every Block such as Axis, Legend, Colorbar, etc. can be themed by using its type name as a key in your theme.

Here is how you could define a simple ggplot-like style for your axes:

ggplot_theme = Theme(
    Axis = (
        backgroundcolor = :gray90,
        leftspinevisible = false,
        rightspinevisible = false,
        bottomspinevisible = false,
        topspinevisible = false,
        xgridcolor = :white,
        ygridcolor = :white,
    )
)

with_theme(example_plot, ggplot_theme)

But it is not obvious (possible ?) how to modify the working examples :

LScene_theme = Theme(
    LScene = ( 
        scene = (
            OldAxis = Dict(
                :names => (
                    axisnames = ("x-direction (m)", "y-direction", "z-direction")
                )
            )
        )
    )
)

Does not work and I am clueless on how to apply a function in the theme, say getindex to get the OldAxis object from the scene.
I believe, you wanted to ultimately give public attributes to the LScene like an Axis3 or a normal Axis, but in the meantime, the absence of accessible attributes or documentation makes it annoying to tweak !