Filtering FLCustomier::$_panels

Is there any filter for FLCustomier::$_panels ?

I want to add my own panel under “content” but it is a private variable and I cannot see any public method or filter available.

I guess I can use FLCustomizer::add_panel() to create my own but I would rather add my child theme options into logical location.

I would rather not completely override the panel content file because I think this is likely to change in updates and I am unlikely to notice.

Have you guys set any way for interacting with the panels array?