OH3: Display in the Web Frame Card widget

Setup, Configuration and Use Migration
1

Hello,

Under Openhab 2.5, the following HTML format (integrated into a user widget template) showed me the current value of an item. It is the information component of a map that is called up in the same widget. In Openhab 3, I have now integrated the card into the “Web Frame Card” widget and it is also displayed there without errors. However, the info part is no longer displayed as a value, but as the text “{{itemValue (‘TankAralE5’)}}”.
I have already spent many hours trying to find a solution, so far I have not succeeded.
Can someone from the experts tell me what I have to do to correctly display the item value via the HTML format?

.....
<div>
    <div class="container">
        <div id="map"></div>
        <div id="wrapper" style="display: inline-block;">

            <table class="table table-bordered text-right" align="middle">

                <tr id="aralE5">
                    <td class="customBtn" ></td>
                    <td class="customText" style="font-size: 12px;" height="60px" width="130px"></td>
                    <td style="min-width:50px" align="center"><img src="http://xxx.xx.xxx.xxx:xxxxx/static/bilder/aral-1.svg" alt="Aral" width="32" height="32"></img></td>
                    <td >Sorte&nbsp;E5</td> 
                    <td style="min-width:50px">{{itemValue('TankAralE5')}</td> 
                </tr>
.....
2

Since I have not received an answer so far, I am asking the question a little differently: Why is the item value under OH3 not displayed in an HTML query? Does the code have to be formulated differently, because this is how it worked with OH2.5.