Newline in "dynamic carousel" JS-block?

I have been trying to get a newline (\n) into the custom block for a carousel (in a card description), when using a JavaScript block to send the JSON data, but it never seems to render. Is there any fix to this or is this a limitation of using custom actions?

So to be clear, this:

let desc = "line 1 \n line 2 \n line 3";

let desc = "line 1 \n line 2 \n line 3";

does not work, it is rendered as:

line 1 line 2 line 3

line 1 line 2 line 3

Any help or clarification would be great!

Newline in "dynamic carousel" JS-block?

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