Passing variables from one update function to another

Hello, is there away to return the results from one function attached to a callback to another function tied to a different callback? (Goal: After 2 different files have been parsed (1 containing raw data which will have a regression performed on it, and another independent file that has labels for each regression) I would to display a plot of the regression through dcc.Graph() after the related label has been selected from a dropdown menu.) How would I be able to get the 2 outputs from these 2 different callback functions and pass them to a dcc.graph() callback after a dropdown selection? Thank you.

def update_output(contents,file_names):
    if contents is not None:
        children=[parse_data(a,b) for a,b in zip(contents,file_names)]
        print(children[0][1])
        
        return children[0][0]

@app.callback(Output('dropdwn','options'),
              Input('upload-cmp_nme', 'contents'),
              State('upload-cmp_nme','filename'))                             

def update_output(contents,file_names):
    #print(contents,file_names)
    print(children[0][1])
    if contents is not None:
        options=[parse_platemap(a,b) for a,b in zip(contents,file_names)]
        #print(options[0]['value'])
    else:
        options=[{'label':"",'value':""}]   
   
    return options[0]    

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