You're describing traditional Vietnamese coffee for ca phe sua or ca phe den, it's close to burnt coffee because the sourced coffee beans are shit so they have to roast close to charcoal that's why we have to add a lot of sugar or condensed milk.
If you want to have coffees that taste close to specialty coffee then there are some local shops that colab or have their own farms that grow quality beans, but Idk if there's exporting roasted coffees.
I've seen a Vietnamese coffee brand from Amazon with fancy branding but my bet is still shitty coffee. Then the recommended way would be traveling to Vietnam, maybe?