import panel as pn
pn.extension()

text_area_input = pn.widgets.TextAreaInput(name='Text Area Input', placeholder='Enter a string here...')
text_area_input

text_area_input.value

pn.widgets.TextAreaInput(name='Growing TextArea', auto_grow=True, max_rows=10, rows=6, value="""\
This text area will grow when newlines are added to the text:

1. Foo
2. Bar
3. Baz
""", width=500)

pn.widgets.TextAreaInput(name="Vertical Adjustable TextArea", resizable="height")

pn.Row(text_area_input.controls(jslink=True), text_area_input)