Can wordcloud2.js specify the shape of the word cloud?

need to draw a human shape word cloud. After searching, it is found that wordcloud2 R language can have interface specification, but js can not find how to specify word cloud shape. After reading the document on github, shape describes it as follows:
shape: The shape of the "cloud" to draw. Can be any polar equation represented as a callback function, or a keyword present. Available presents are circle (default), cardioid (apple or heart shape curve, the most known polar equation), diamond, square, triangle-forward, triangle, (alias of triangle-upright, pentagon, and star.
I don"t quite understand the polar equation here. I would like to ask, if you can specify the shape of the word cloud, how to adjust


refer to the official Chestnut

there is also an official generator

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