Ternary plot missing `automargin` option in `layout.ternary`

Currently the Ternary plot: https://plotly.com/javascript/ternary-plots/
doesn't have automargin option in each axis in the layout.ternary: https://plotly.com/javascript/reference/layout/ternary/

Therefore, it may happen that the title of the axis is cropped, not only in the case of long titles, but more often due to smaller screen sizes (or figure sizes).

This is more likely for the title text in axes B and C located in the bottom being cropped, e.g.:

Titles are being cropped!

Demo example: https://codepen.io/Lexachoc/pen/MYgVGoW

The title in axis B has no margin to adjust the position and is therefore cropped.

It would be very helpful to add this option (or a similar one to achieve the same thing, avoiding the title text being cropped) to the ternary plot.

layout.ternary のリファレンスとリンクされている ternary plot の例から始め、軸タイトルとマージンがどのように処理されているかを追ってください。ternary 軸が automargin オプションまたは同等の動作を備え、特に軸 B と C のタイトルが小さい図で切り取られなくなれば、作業は完了です。