django string interpolation struggles

Hi so I am having a problem trying to concatenate in django. I have created a new templatetag and im trying to get the string interpolation right and im struggling a bit.

{% button text="Reset" onclick="test('{{user.id}}')" colour="yellow" %}function test(user_id){    console.log('user id:', user_id)}

the console log just gives back user id: {{user.id}}

{% button text="Reset" onclick="test('"|add:user.id|stringformat:"s"|add:"')" colour="yellow" %}

I have also tried this way but it just gives me a syntax error.

any help on how to properly do this or even if its not possible any help would be great.

(still new to django)