CRC value is CRC run over the message values, in over-the wire order, then with a CRC EXTRA accumulated on top. The CRC extra is a definition of this message format (i.e. it is a CRC run over the message definition including the name of the mission, and the names/types of each of the fields).
On receiving a message you can run the CRC on the received data and then apply the CRC extra. If the resulting number matches the value you see above, then you would know that the message had not been corrupted in transit AND that the receiver has the same understanding of the message definition as the sender.
Info on this in
https://mavlink.io/en/guide/serialization.html#crc_extra