How will i get a value from datalist where data are fetch from mysql database?

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PHP

MySQL

So, I have this code which can fetch data from database:

<?php
            //connect to database
            $conn = mysqli_connect("localhost", "root", "", "inventory");
          
            if(mysqli_connect_errno($conn)) { 
              echo "Unable to connect to database server";
            }    
            
            //query database for items to populate
            $sql = "SELECT ITEM_NAME FROM item";
            $query = mysqli_query($conn, $sql);
            
            echo '<datalist name="list1" id="list1" onchange="showUser(this.value)">'; //change select to datalist
            echo '<option value="">Select item</option>';
            
            while($selectedItem = mysqli_fetch_assoc($query)) {
              echo "<option>{$selectedItem['ITEM_NAME']}</option>";
            }

            echo '</datalist>'; //change select to datalist

            if (isset ($_POST['submit'])) {
              $selectedItem = $_POST['list1'];
            }

    ?>

In this part echo "<option>{$selectedItem['ITEM_NAME']}</option>";
I'm displaying the data from the database, but I need to get the corresponding value from the datalist.

Hope to hear a lot from you guys! Thanks!

What I have tried:

I tried to do it like this
echo "<option value=".$selectedItem.">{$selectedItem['ITEM_NAME']}</option>";