I have become a fan of single-file web applications. Now I try to make it installable via an embedded manifest. Ideally I would like

• to have the manifest directly editable (i.e. not base 64 – when using base64 here, the lines can be arbitrarily short)
• not have very long lines as the icon data URI src attributes

<link rel="manifest" href='data:text/javascript,{"name":"my app name",
"short_name":"appshort",
"start_url":"https://some.url/this.html",
"icons":[{"src":"data:image/png;base64,iVBORw0KGg...(a lot more)"
...

The problem that I have is that I can not find a way to break the data:image/png;base64... lines.

Putting a before a linebreak gives Invalid escape sequence (all errors as shown in the DevTools under Application/Manifest).

Putting \ before a linebreak gives a Syntax error at the end of the line.

Using a single backtick ` to start and end the data:image/png... (which is a kind of javascript way to say ignore newlines in the string) gives a Syntax error at the start of the string.

I can put n anywhere inside the long string but of course it will not make the line shorter.

Impossible? Suggestions? Thanks!