Unless you don't want to receive any vaccinations and file a waiver based on religious or moral conviction. I came on K1, did my medical in The Netherlands and filed a vaccine waiver on religious grounds together with my AOS and vaccine sheet (DS-something, 2035?).
If people have genuine convictions against the vaccines they have that option, but only if they can provide enough credible evidence that they are against ALL vaccines. So if you had vaccines recently it will be harder (not impossible!) then when you only received them as a child, like me. But if you REALLY don't want to receive any more, it's your only option.
I didn't have to get the Covid vaccin when I had my medical, it was not available anymore so the CS thought she could administer the others I missed. They're honestly assuming you just take them, I even felt some pressure and the CS seemed misinformed because she said my visa might have been denied, which is not true in case of non-immigrant visas. So I had to explain I didn't want any at all and that I'd be filing a waiver. Same should be possible from abroad, but I think you then have to wait for denial based on inadmissibility to file the waiver.