Appends a sub-selector to an existing one.
Given the compounded $selector "h1, h2, h3" and the $to_append selector ".some-class" the result will be "h1.some-class, h2.some-class, h3.some-class".
$selectorstringrequired
$to_appendstringrequired
* }
*
* It returns the following output:
*
* {
* "styles": {
* "blocks": {
* "core/paragraph": {
* "variations": {
* "section-a": { "color": { "background": "backgroundColor" } }
* },
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https://developer.wordpress.org/reference/classes/wp_theme_json/append_to_selector