What are the approaches in simulink to define a transfer function whose denominator is a non-integer order statement?

Hi,

In a simulink model, I want to implement a transfer function whose denominator is a statement of non-integer order (e.g. 0.8*s^2.2+0.5*s^0.9+1)

I am familiar with "Transfer Fcn" block from simulink\continuous library but its denominator is a polynomial of integer order

What could be a suitable approach?

Best Regards,

Sahand