Consecutive style blocks for selectors and inline styles

[En3Tho]

    First example: using curly brackets to indicate a consecutive style block for a selector
    <div class="placeholder:{italic text-slate-500}
                       placeholder:after:{content-['*'] ml-0.5 text-red-500}">
        ...
    </div>

    Second example: using an inline style:
    peer-style/name:{classes} - available for peers
    group-style/name:{classes} - available for children
    style/name:{classes} or file-style/name:{classes} - available for file

    To use it in declaring element use it again after declaration otherwise it can just be used as template?
    <div class="
        style/shadow-deep:{shadow-[inset_0_2px_0_hsla(0,_0%,_0%,_.25),_inset_0_-2px_0_hsla(0,_0%,_100%,_.25)]
                                        focus:shadow-[inset_0_2px_0_hsla(0,_0%,_0%,_.35),_inset_0_-2px_0_hsla(0,_0%,_100%,_.35)]}
        shadow-deep">
    </div>

I don't know if things like these been proposed already (sorry if there were). I did some search but couldn't find similar thing (maybe I used wrong wording).

Sometimes I would really like not to repeat a selector:class1 selector:class2 selector:class3 thingy but use selector{class1 class2 class3} instead. So I'm proposing adding curly brackets as a mean to create a consecutive class scope for a selector.

Pros: a nice way to reduce repetition, especially when you've got something like "focus:... focus:... [customSelector]: ... [customSelector]: ... other:... other: ... other: ..." I saw complex components having stuff like that and kinda wasting textual space on repeated selectors

Cons: curly brackets are used in many programming languages as a mean to insert a value to interpolated string. Maybe some other neutral bracket-like thing is better.

Other thing I'd like to propose is inline styles. Maybe the best answer to this is just "Man, just chill and use your .css file" or "Man just export your custom class to module.exports" but I sort of think it could be nice to have an ability to create inline classes directly in html. Especially when you want this thing to be file-scoped and all in one file.

What do you think?