Until(Func<char, bool>) and Where(Func<string, bool>)

[Shadowblitz16]

is there a way to do this with the framework?
Until is kinda useless because we can't compare the current char or string to a char, char[], string or string[].

{
    public static class MyParser
    {
        internal static Parser<string> Str(this Parser<char> self) => self.Many().Select(s => string.Concat(s));

        internal static Parser<char>   OneOf(params char[] n) => Parse.AnyChar.Until(c => n.ContainsOne(c));
        internal static Parser<char>   AnyOf(params char[] n) => Parse.AnyChar.Where(c => n.ContainsAny(c));
        internal static Parser<char>   AllOf(params char[] n) => Parse.AnyChar.Where(c => n.ContainsAll(c));
        
        internal static Parser<string> While(this Parser<char> self, Func<string, bool> pred) => self.Str().Where(pred);
        internal static Parser<string> Until(this Parser<char> self, Func<string, bool> pred) => self.Str().Until(pred);

    }

if not can this be added?

EDIT2: