How to open menu links in new tab?

[amarc]

Hello,

so I have this in my config.toml:

Main menu which appears below site header.

[[menu.main]] name = "Home" url = "/" weight = 1

[[menu.main]] name = "Posts" url = "/posts" weight = 2

[[menu.main]] name = "Photos" url = "https://my.externalurl.com" weight = 3

How would I make "Photos" link to open in new tab (_blank) ?

Thank you