Flow接口能否提供registerGroup方法?

[liekkas]

现在无法自定义群组，群组样式也无法修改。

[ShMcK]

The following methods exists:

import G6Editor from '@antv/g6-editor'

G6Editor.registerGroup(a, b, c, d)

G6Editor.Flow.registerGroup(a, b, c)

Without documentation, it's not clear what the params may be.