Even if this was a thing, you could just wear an N95.
According to duck.ai, Aerosolized medicine particle size is typically 1-5 microns. N95's are supposed to be good down to 0.3 microns.
Discussion
mRNA is measured in nano-scale, hance lipid NANOparticles that package them. But its not possible and almost certainly never will so still nothing to worry about