{% table
    data="demo_daily_orders"
    date="date"
    series="case when total_sales > 18000 then 'High' when total_sales > 9000 then 'Medium' else 'Low' end"
/%}

{% table
    data="demo_daily_orders"
    date="date"
    series="""
        case
            when total_sales > 18000 then 'High'
            when total_sales > 9000 then 'Medium'
            else 'Low'
        end
    """
/%}