Multiple shortcodes

[kewp]

I'm trying to use multiple of the same shortcode in the same article (thanks for this repo, by the way, it's saved me a ton of time). Of course we need unique ids for the elements:

add_shortcode("SHORTCODE_CODE", function ($attributes, $content) {
    $element_num = rand(1000,2000);

I'm using that variable to assign the ids. However, how do I pass this number to my code, i.e. my sveltekit app? Otherwise I can't get the attributes ...