They are available in v2.3.
However, in LuxCore only emissive materials (meshlights) can use textures, all other lights do not have texturable parameters. Blender area lights are just meshlights in Lux behind the scenes, so they can use textures. However I would recommend to just use a mesh object with emissive material instead, because area lights with node trees will miss some viewport updates when doing adjustments.
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