ggVennDiagram stores shapes as internal data. You may see all the shapes by using `plot_shapes()` or `get_shapes()`.
get_shape_data(nsets, type = NULL, shape_id = NULL)
a tibble describing specific shape
get_shape_data(nsets = 4, type = "polygon")
#> Class VennPlotData - '402'
#> Type: polygon; No. sets: 4; No. regions: 15.
#> To view this shape, use `plot_shape_edge(get_shape_by_id('402'))`.
#> To view its components, use `venn_setedge()`, `venn_setlabel()`, etc.