escape nested content in macro?

Hi,
I have a macro that needs to escape as javascript its nested content.

Calling:
<@my_macro>
This "text"
Needs to be 'escaped' for JS
</@my_macro>

I tried things such as:
<#macro my_macro>
var v = "<#escape x as x?js_string><#nested></#escape>";
// do something with v
</#macro>

But I cannot get anything to work. How do I do something like that without
defining the text as a variable using assign?

Thanks

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