What is the maximum data transmiot rate

The sensitivity tables give  ahint: for 433MHz, they only have a 250kBd row, for 868 and 915MHz, there's a 500kBd row.
The users guide also tells "Programmable data rate from 0.8 kBaud to 500 kBaud" for the "CC1101-based radio module"

For 200ksps, you'd need at least 1.6MBd (8 bit data) or even 2.4MBd (12 bit), not counting the overhead for the package frame. On a serial port (with start and stop bit), you'd at least need 2MBd, which is twice as much as the serial UART allows.

You may try to reduce your data by some sort of compression. e,g a bitstream where each bits tells '+1' or '-1' relative to the last value. Or two bit per value, stating +1, -1, +-0 or an absolute value following the two bits. This allows a shortcut for larger jumps.