Subgraph from Mermaid should be rendered as grouped elements

[finalspy]

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• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe.
I'm always frustrated when I import from Mermaid schemas containing subgraph where element are not grouped into DrawIO. If there's a lot of subgraph and elements it's a very long process to group everything to then be able to move all at once for a group ...

Describe the solution you'd like
When a subgraph is declared in mermaid, it should be rendered as a group. I mean all the elements of the subgraph should be grouped together.

Describe alternatives you've considered
Doing it manually but it's tedious.