Is there a way to extend enums with more values?

Help
,
1

I particularly am looking into:

// in lib
pub const STATUS_SIGNALS = enum(u8) {
    EXIT_SUCCESS = 0,
    EXIT_FAILURE = 1,
    EXIT_TIMEDOUT = 124, // Time expired before child completed.
    EXIT_CANCELED = 125, // Internal error prior to exec attempt.
    EXIT_CANNOT_INVOKE = 126, // Program located, but not usable.
    EXIT_ENOENT = 127, // Could not find program to exec.

    pub fn exit(self: STATUS_SIGNALS) u8 {
        // some code before exit ...

        std.posix.exit(@intFromEnum(self));
    }
};

// in program
const TTY_STATUS_SIGNALS = enum(u8) {
    // also note the repeating value here
    TTY_STDIN_NOTTY = 1,
    TTY_FAILURE = 2,
    TTY_WRITE_ERROR = 3,
};

Im also open to other options, but im still curious about title.
I dont actually think its posible with enums.
Also note the repeating value 1.

2

Talking about other options maybe im coming at this from an outdated perspective and it would be best to come with error sets, but dont know where to start with that