Addding custom visualizations into meta base

Is there any way we can add custom visualizations into the meta base. More specifically, our top priority is making a Sankey and box diagram in Metabase: https://en.wikipedia.org/wiki/Sankey_diagram , https://en.wikipedia.org/wiki/Box_plot

Does anyone have experience in achieving something similiar, what was your experience in customly modifiying Metabase and any suggestions that you might have? I found only one thread so far about this:

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Hi @ayazwani
If you do a bit more searching, then you will find a lot of topics about it.
https://github.com/metabase/metabase/issues/1710
https://github.com/metabase/metabase/issues/2318
https://github.com/metabase/metabase/issues/7351
And then you can search the forum too - example:
https://discourse.metabase.com/search?q="https%3A%2F%2Fgithub.com%2Fmetabase%2Fmetabase%2Fissues%2F2318"

I would recommend that you have a look at Waterfall visualization, which was added in 0.38, so you have an idea about how much work it takes:
https://github.com/metabase/metabase/pulls?q=is%3Apr+author%3Aariya+is%3Aclosed+waterfall