app.py

#!/usr/bin/env python

import gradio as gr
import pandas as pd

df = pd.DataFrame(
    data={
        "a": ["a", "b"],
        "b": [
            """
- Item 1
- Item 2
- Item 3
""",
            "c",
        ],
    }
)

with gr.Blocks() as demo:
    gr.Dataframe(value=df, datatype="markdown", line_breaks=False)

if __name__ == "__main__":
    demo.queue().launch()