mortalYoung opened a new issue, #20581:
URL: https://github.com/apache/echarts/issues/20581

   ### What problem does this feature solve?
   
   I found the pie chart only support `item` tooltip.
   But if i got a nest pie chart, and i wanted to show all series data when 
hover the item(highlight current one), it was difficult to do.
   
   I could use my chartData instead of get params from `formatter`. But it gets 
some problems when hidden by legend.
   
   
[Example](https://echarts.apache.org/examples/zh/editor.html?c=pie-nest&code=PYBwLglsB2AEC8sDeAoWszGAG0iAXMmuhgE4QDmFApqYQOQRjUC29ANMegGbCksBDMMzqwAFCAGkBLAM4BKBAD4iJEgGMYssLFm0I1WQFlgAE2rYEsFgE8AwgAspYLmtgA6GmBPnsY-a5qAPRBsOpO0DS6-oYAktDmAB6wENywNsAArrAA7gLQOpiwXrDAYA600eSGKdC8_EJQ0IEkIaWksJl6GBWwAAbUAuEAyjGyfbDcmdDqkDAYwCkiQtSwAtiWetWyLehtAEaZOiDYg93QZRDqq-WrfV4-FhMAggAKsSmysBfHmfvYV0mfG-wByu1gbS6qyYtVgIFIZkysyasGo0AAbhAESw0Tp1FJqFMNjZwZ5qGBRtsAEI2eJJCRSGSydxbAyyOnURLyADcLU00FkOGo7mwwAoYnorJqEDqwA4VTZj2wZLAABEhAJ_Dy-VodPVBMJKogpcYzBZ3KA5tB3KYNe5BCAxOCxBB2ClTFzlOD0H0ADyySRwbQ2U7wABEvAKAFoctRKA4wIQACSoNxpuGMuQ2jUc5LwfPu5IAflg9H2OFM9FgDAuDWw9G9sAAvmGlCmIO5oDJqE38O33Oj1pke76ggH8ko-i1tWnSOTMqQ4PqhCJ3AArYAyiW-_akJT0GckJvEJucdCnGgJQipki2sACQgAbRa9FVWOosw4L6MUgA1uSZQoL803oUYpHCWAAFFIhlahgLcehIMECB6zPBCAFVoBRZ5TFkeC1HoAA1CBzEWHC8LQgiqQEEjMnwkh6AAcSwChTno9B6CpQD2NLAB5W5SDw1wAF0TzQk0n1cG81C7HEGGedRrlkL4ADFsR4sAbBAagGBAAweL0U5ZmoUxHgYWRALYyiSGkUwIC6J8AAY3XoABmRyAFJ6GE6zzwEfYLGvcEQGACyrQYGVo
 
FoHieBgCkIAALx02AAEYABYWlPFpsH8iwABlYKC9NdAcUFCG4dY9Ey3zYDvB9YGfYqkFgQdsGHQgUoAVjSgAON1ZOS0DBlICDoIoWCqyypqWqHZKAHY5s6_ruwYN850_ZsavQZrWva2AADY5oATmWuTSx_Uh_0gSJ5UMj9mFMQgwFIYdmxaUS1CmkhpJIAb5MUwxVPUmrNO03T9Jq2z7NkJ96DSzqvJc_bPO8mqcoC7ACqior01OSJykIdzquy3LsBxtNl0NUR6CQAQAB9aabJtaf2Cg6abAAdaAkAcUh2a57b9gZ_Ym0ALH_mfUJttu0vmkFMJsPKl0sttgfYhl_CgEWmUw7BwPgGAAYhU_aVJ6lS7Bi1W-HMUhddFamDZ6uwetVHrIMt8tSBtgB1EiCdSlXPZtgAlAQ7Ic2A0pV8hwnJ9N6p-4rNHtw39sgubHOOy21ABKKAAk4woBNCAAJhLlW1HWShoAYa4CmixsvuK3m4-KoPaDt_XS0d53XfdiuSByP2HAYFLHJRgf0Hb0hfdMf2Usn2AKnjRNYEcxuB_2Vv02Trv6ANtK7E6xzOp67OSEjeKko6qPG1igpvcL4vS3LbBK0X3PqALlfCdcjfGxltvNMu8HbcDAefKe6tNZZASJ3B2h9j6nwgRmUwdlIhPlcm6NKPk75Wy9rQUO4cYaR0buCY8aYm63g1JJaau1kpj16qdQa1FaKTRVjtWav8lrfBWqWNa902Hgg4W1ZKrkx5MIYEhGi9ZNpCJmiI0unUF48LOkxFibFZG0M4bAEurko4qMGphbCuFBFaIUalNKc0JGli4jdTR6ZhF7RSq5bhf1SzEVIrAcipiHHyKcY5cuBiGD8QqIJSa71XDkNgKJJs3IgA)
   
   ### What does the proposed API look like?
   
   ```js
   tooltips:{
       trigger: 'series', // ONLY support for Pie
       formatter:(params: Array) => {
           // do something
           return '';
       }
   }
   ```


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