Return dictionary to callback output

Dash Python
1

Hi all,

I find it very useful to use a dictionary when having a larger callback with multiple inputs.
But when I try the same for callback outputs returning a dictionary I am struggling with the syntax.
I found the callback signature in the manual here:
https://dash.plotly.com/flexible-callback-signatures

Here is a MWE with dict as input and list as output:

from dash import Dash, html, dcc, Output, Input

app = Dash(__name__)

app.layout = html.Div(
    [
        dcc.Input(id="input"),
        dcc.Store(id="storage"),
        html.Div([], id="label"),
    ]
)

@app.callback(
    Output("storage", "data"),
    Output("label", "children"),
    inputs=dict(foo=Input("input", "value")),
)
def getinput(**inputs):
    print(inputs["foo"])
    return [inputs["foo"], inputs["foo"]]


if __name__ == "__main__":
    app.run_server(debug=True, port=8051)

but when trying with dict as output I get an error:

from dash import Dash, html, dcc, Output, Input

app = Dash(__name__)

app.layout = html.Div(
    [
        dcc.Input(id="input"),
        dcc.Store(id="storage"),
        html.Div([], id="label"),
    ]
)


@app.callback(
    outputs=dict(store=Output("storage", "data"), label=Output("label", "children")),
    inputs=dict(foo=Input("input", "value")),
)
def getinput(**inputs):
    print(inputs["foo"])
    return dict(store=inputs["foo"], label=inputs["foo"])


if __name__ == "__main__":
    app.run_server(debug=True, port=8051)

the error is:

Please provide an output for this callback:
{
  "clientside_function": null,
  "inputs": [
    {
      "id": "input",
      "property": "value"
    }
  ],
  "long": null,
  "output": "....",
  "prevent_initial_call": false,
  "state": [],
  "outputs": [
    {
      "id": "",
      "property": "",
      "out": true
    }
  ]
}

How can I access the “outputs” dictionary and set values for the keys “store” and “label”?

Thank you for your help!