WireShark can conveniently dissect Ethernet frames, and tell you exactly what each byte means. For example, it tells you where the TCP/IP headers are, how they have been populated and if the checksums are OK.
Now I have an Ethernet frame encoded as a long HEX string. (It's not a captured frame.) Is there a way to enter that HEX string into WireShark and have it analysed for me?