Voila

import ipywidgets as widgets

slider = widgets.FloatSlider(description="$x$")

text = widgets.FloatText(disabled=True, description="$x^2$")

def compute(*ignore):

    text.value = str(slider.value ** 2)

slider.observe(compute, "value")

slider.value = 4

widgets.VBox([slider, text])

voila --help-all

voila a.ipynb --VoilaExecutor.timeout=120 --VoilaConfiguration.file_allowlist="['.*']" --NotebookClient.iopub_timeout=30