I will do an example with the product listing cms and add a new field name is hungMac.
In my plugin, I will create an index.js file at src/Resources/app/administration/src/module/sw-cms/elements/product-listing/index.js
const cmsElements = Shopware.Service('cmsService').getCmsElementRegistry();
// Get the cms element of product-listing cms
const cmsElProductListing = cmsElements['product-listing'];
// Check the field named HungMac does not exist yet
if (!cmsElProductListing.defaultConfig.hungMac) {
cmsElProductListing.defaultConfig = {
...cmsElProductListing.defaultConfig,
hungMac: {
source: 'static',
value: 'this is my data'
},
}
Note: after adding, you should remove the old element in your layout and then add it again.