Not able to call a variable/function inside HTML markup where that is required to make dynamic href

Summary:

Not able to call a variable/function inside HTML markup where that is required to make dynamic href with year value, but we have a requirement to generate a link and point it href. So year value we need to fetch based on current date and append in the link to make it dynamic to show the current year holiday calendar.

Content (required):

able to run the html file in browser and getting the dynamic link properly but when pasting the same html code inside the HTML markup text inside page customization, it is not working, attaching the html code.