Thanks, I understand. Cool idea.
Currently there is no functionality that directly supports it, but with augend.user, you can manually implement user-defined augends like this:

local dial_config = require "dial.config"
local augend = require "dial.augend"

local elements = {}  -- internal state referenced by `inline_constant_*` function

local function inline_constant_find(line, cursor)
    local pattern = "switch: (.+)$"
    local match = line:match(pattern)
    if not match then
        return
    end

    elements = {}
    for option in match:gmatch "([^,]+)" do
        table.insert(elements, option:match "^%s*(.-)%s*$")
    end

    local vim_regex_ptn = ([[\V\(%s\)]]):format(table.concat(elements, [[\|]]))
    return require("dial.augend.common").find_pattern_regex(vim_regex_ptn, false)(line, cursor)
end

local function inline_constant_add(text, addend, cursor)
    local n_patterns = #elements
    local n = 1
    for i, elem in ipairs(elements) do
        if text == elem then
            n = i
        end
    end
    n = (n + addend - 1) % n_patterns + 1
    text = elements[n]
    cursor = #text
    return { text = text, cursor = cursor }
end

dial_config.augends:register_group {
    default = {
        augend.user.new {
            find = inline_constant_find,
            add = inline_constant_add,
        },
    },
}

When <C-a> / <C-x> is executed with this config, the end of the cursor line is searched, and if the end of the line matches switch: xxx, yyy, ..., it will act as an addend to toggle xxx and yyy and ... .
I think the above implementation satisfies the request.

It will be nice if this feature is implemented in dial.nvim and can be used with only a few settings, but the format of the switch: xxx, yyy part is completely user dependent and difficult to formulate.

inline switch feature support #104

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