The Lightroom plugin does not support presets like JuiceboxBuilder does (at least not in the same format) but there are a couple of things that you can do which might help.

(1) You can open a gallery created by the Lightroom plugin in JuiceboxBuilder-Pro, apply a preset to it and save it on the 'Publish' tab.

(2) In Lightroom, you can save a set of Juicebox configuration options (like a JuiceboxBuilder preset) as a template.
With the settings as you want to save them, click the + sign to the right of the text 'Template Browser' (in the left panel of the 'Web' section) and select a name for your template.
At any time in the future, if you want to apply these settings to a gallery, expand the 'Template Browser' control panel, scroll down to the 'User Templates' section and select your template.