Wordpress run php-script that adds dynamic shortcodes to a page before load

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I have a script that loops through a JSON-datafile and from that file creates dynamically shortcodes that I want to be loaded in a spesific Wordpress page. The script loads different JSON-files depending on the logged in users ID.

the shortcodes look like this after processing:

[woocommerce_product_documents product_sku="70.2991" title="nozzle for Adheseal"]
[woocommerce_product_documents product_sku="70.0900" title="Spraygun Multiflexcoating"]
[woocommerce_product_documents product_sku="70.2901" title="Spraygun Nozzle Coating."]

When manually added to a WP page the shortcodes are executed as normal. What I am trying to figure out is how to add/update the page dynamically, when the customer requests it. a.k.a run the script and get updated information from the JSON-file.

I know I can set a condition for the script to run on spesific conditions. But I haven't figured out how to make WP execute the shortcodes before the page is loaded. as if they were already there ?

If there is an answer to this question somewhere that I have missed, please send me a link. Thank you for your help.