helgasoft commented on issue #21340:
URL: https://github.com/apache/echarts/issues/21340#issuecomment-3488219184

   > I read options documentation, no explaination about key-value set.
   
   Yes, but 
[api.value](https://echarts.apache.org/en/option.html#series-custom.renderItem.arguments.api.value)
 depends on _dimension_, which is applicable only to array-type data. There is 
no dimension, or guaranteed order, in key-value (object) type of data. In your 
example then:
   ```[new Date('2025-11-04'), '50']``` has two dimensions
   ```{x: new Date('2025-11-04').getTime(), y: '50'}``` has none, so it cannot 
be used in _api.value()_.
   


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