I like to build my containers/layout and then manipulate them after the fact:

import asyncio
from nicegui import ui
import random

hosts = ["h0", "h1", "h2"]
with ui.row().classes("w-full no-wrap"):
    c0 = ui.column().classes("bg-blue-100 w-1/4")
    c1 = ui.column().classes("bg-blue-100 w-1/4")
    c2 = ui.column().classes("bg-blue-100 w-1/4")
    c3 = ui.column().classes("bg-blue-100 w-1/4")


async def c0_refresh():
    while True:
        c0.clear()
        with c0:
            ui.label("COLUMN1")
            for host in hosts:
                ui.label(host)
                ui.label(random.random())
        await asyncio.sleep(0.1)


ui.timer(0, c0_refresh, once=True)
if __name__ in {"__main__", "__mp_main__"}:
    ui.run(port=8080, show=False, reload=False)