You can pass a pointer to any data you want, and just specify the data size.
e.g. If you have 16bit unsigned integer:
uint16_t someNumber = 65535;
Then you can send it to Port 3 with the following:
LoRaBee.send(3, &someNumber, sizeof(someNumber));
However, you probably want to prepare a larger buffer and pack in some other values as well. For example you can pass an array instead.