from bokeh.models.widgets import FileInput

div = Div(text='<div id="document-container10"></div>', width=500, height=500)

l = FileInput(accept='.json')

l.js_on_change('value', CustomJS(code="""
function b64DecodeUnicode(str) {
    return decodeURIComponent(atob(str).split('').map(function(c) {
        return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
    }).join(''));
}

const {Document} = Bokeh.require('document/document');
const data = JSON.parse(b64DecodeUnicode(cb_obj.value));
const doc = Document.from_json_string(data);
Bokeh.embed.add_document_standalone(doc, document.getElementById('document-container10'), [], true);
cb_obj.disabled = true;
"""))

show(column(l, div))