part parameters in label templates

[ganjiefong]

How can i use the parameter in the custom stock_items label?

{% extends "label/label_base.html" %}

{% load l10n i18n barcode report %}

{% part_parameter item.part "Gross Weight" as grossWeight %}
{% part_parameter item.part "Length" as length %}
{% part_parameter item.part "Width" as width %}
{% part_parameter item.part "Height" as height %}

{% block style %}
img {
display: inline-block;
image-rendering: pixelated;
}

.label {
padding: 4mm;
}

.header {
font-size: 14px;
font-weight: bold;
text-transform: uppercase;
}

.sub-header {
font-size: 10px;
margin-bottom: 2mm;
}

.info {
border-top: 1px solid black;
border-bottom: 1px solid black;
padding: 2mm 0;
font-size: 10px;
display: flex;
justify-content: space-between;
}

.info div {
flex: 1;
}

.info strong {
font-weight: bold;
display: block;
}

.qr-section {
display: flex;
align-items: center;
justify-content: space-between;
position: relative;
}

.qr-section div {
flex: 1;
display: block;
}

.qr {
width: 25mm;
height: 25mm;
}

{% endblock %}

{% block content %}
<div class="label">
    <div class="header">{{ item.part.name }}</div>
    <div class="sub-header">{{ item.supplier_part.sku }}</div>
    <div class="info">
        <div>
            <strong>GROSS WEIGHT (g)</strong>
            {{ grossWeight.data }}
        </div>
        <div>
            <strong>LENGTH / WIDTH / HEIGHT (mm)</strong>
            {{ length.data }} / {{ width.data }} / {{ height.data }}
        </div>
    </div>
    <div class="qr-section">
        <div>
            <img class="qr" alt="QR Code" src='{% qrcode qr_data %}'>
        </div>
        <div>
            {{ ipn }}
        </div>
        <div>
            {{ item.batch }}
        </div>
    </div>
</div>
{% endblock %}

[SchrodingersGat]

Your example here looks like it should work - according to the docs