# Additional data

1. Select the shape by `name` you want to modify. See [here](https://docs.powerpointgeneratorapi.com/knowledge-base/finding-shape-names) to find shape names.
2. Use `additional_data` to insert custom values directly into specific cells. 
3. Each `cell_target` defines the starting cell where the data will be written.
4. `Additional_data` is not tied to the chart’s data range, so you can add data anywhere. It's useful for when you want to add helper values, metadata, or computed fields without affecting the main chart series.

Reference: [chart](https://docs.powerpointgeneratorapi.com/json-template-syntax/shapes/chart "mention")

Download: [input.zip](https://drive.google.com/uc?export=download\&id=1RjhuXp3a-I531dgZBia3_80O6akhWQO8) | [output.pptx](https://drive.google.com/uc?export=download\&id=1CynZMM_5aPHuI4wjGAwVTCm1hwSkNtAC)

{% columns %}
{% column width="41.66666666666667%" %}

<figure><img src="https://1155212587-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Mgoqdluo05I2RXHZpTr-887967055%2Fuploads%2FfrODf695CMZQl51D7wmr%2Ftemplate.png?alt=media&#x26;token=75eaf4f0-b7b3-4103-8366-44a553411dcd" alt=""><figcaption></figcaption></figure>

***

<figure><img src="https://1155212587-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Mgoqdluo05I2RXHZpTr-887967055%2Fuploads%2FMiBFtwxqltsEsJzzw8On%2Foutput.png?alt=media&#x26;token=257f9301-0db3-449c-8953-1f1004b7f7c0" alt=""><figcaption></figcaption></figure>
{% endcolumn %}

{% column width="58.33333333333333%" %}
{% code lineNumbers="true" %}

```json
{
    "presentation": {
        "template": "template.pptx",
        "slides": [
            {
                "slide_index": 0,
                "shapes": [
                    {
                        "name": "Chart 5",
                        "additional_data": [
                            {
                                "cell_target": "B22",
                                "data": [
                                    [
                                        0.2,
                                        0.3,
                                        0.35
                                    ],
                                    [
                                        0.4,
                                        0.5,
                                        "0.45%"
                                    ]
                                ]
                            },
                            {
                                "cell_target": "A2",
                                "data": [
                                    [
                                        " ",
                                        35,
                                        0.6
                                    ],
                                    [
                                        "maj",
                                        0.5,
                                        58
                                    ]
                                ]
                            },
                            {
                                "cell_target": "A4",
                                "data": [
                                    [
                                        "Category 3",
                                        5,
                                        10
                                    ]
                                ]
                            },
                            {
                                "cell_target": "AA5",
                                "data": [
                                    [
                                        0.5,
                                        0.2
                                    ],
                                    [
                                        0.455,
                                        0.7234
                                    ]
                                ]
                            }
                        ]
                    }
                ]
            }
        ]
    }
}
```

{% endcode %}
{% endcolumn %}
{% endcolumns %}


---

# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.powerpointgeneratorapi.com/examples/chart/additional-data.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.