To add a Scrolling Text on Squarespace Announcement Bar, you can use a Scrolling Block, then use code to move it to Announcement Bar.
#1. First, you need to edit Site Footer and add a Scrolling Block
#2. Next, use the code to Website Tools (under Not Linked) > Code Injection > Footer
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
setTimeout( function() {
$('footer.sections .marquee-block').appendTo('#announcement-bar-text-inner-id');
}, 2000);
});
</script>
<style>
div#announcement-bar-text-inner-id * {
color: white !important;
}
#announcement-bar-text-inner-id p {
display: none !important;
}
span.sqs-announcement-bar-close {
display: none;
}
</style>
and result
