line break on text created by createElementNS

I feel like I have a very dumb question: I create a text with the following command:

text = document.createElementNS("http://www.w3.org/2000/svg", "text")
text.textContent = "some very long text"

How can I make the string printed span over many lines? The common 'n' doesn’t work. And I found some solutions for html text using the <br/> command, but I don’t know to convert the text to html. I also tried

text.innerHTML = "some text" + <br/> + "some more text"

but this didn’t work.