Is there a way to get a particular WP user's email as dynamic data?

How To
1

I have a WP user called “office”.
I’d like to be able to use this user’s email address in a form’s “send to custom email address”.

I.e. I want my form to send to this user, without hardcoding an email address into the field.

Is this possible?
I’m looking at the “User meta - add key after :” option, but not getting too far.

2

I’ve written a custom function and am able to return the address as such:

function get_user_email_from_id($user_id)
{
    $user_data = get_userdata($user_id);
    $user_email = $user_data->user_email;
    return "$user_email";
}

and

{echo:get_user_email_from_id(2)}

However I can’t paste this into the "send to custom email address”, as this is not treated as typical dynamic data.