No, it doesn’t work like that mRNA isn’t a virus or virus like it doesn’t hijacks the cell. The mRNA fragments are picked up by dendritic cells and antigens are produced. The antigens (and the mRNA itself) are then attacked by special proteins within your cells that are designed to destroy foreign or malformed proteins and the fragments of those destroyed antigens are then presented in the cell membrane for T and B cells to inspect and produce antibodies against.