it depends on the initial code they are using for such elements, if if would be HTML embed, you can easily add it with input element like here: https://andrewtaran.editorx.io/my-site-8
here you can see the limitations:
https://support.wix.com/en/article/editor-x-adding-an-html-iframe-element
but code you are sharing won’t be possible to embed, in this way , as I can see
in case it is js integration, I would like to offer you to discuss this on our Velo coding Forum and our Official Facebook Group