How to change SEO attributes (lang, dir html attribute) with no prefix strategy

[jesspinklet]

I have this in my app.vue for direction and language.

while using strategy prefix and changing the locale with setLocale() it will be updated
as expected.

however, with no prefix strategy it seems it's not reactive or its not getting updated.

is this how it supposed to be? If yes, what's the best way to add a reactive lang and a dir attribute to html?