Good day, can we add a current doubler to a non-isolated SPMS topology like buck-boost?

 

If the SMPS is designed for a certain maximum load current then no, you can't exceed that maximum without risk of damaging the SMPS.

 

The design will be made on the inductor and mosfet sizes, unless you have the datasheet for the chip design, No!.

 

What do you mean by current doubler?

 

You "could" alter the output voltage and in reasonably practical terms by rewinding the main switching transformer along with using suitably rated rectifiers and recalculating the feedback network including under/overvolt protection, halve the voltage, double the current, but you cannot exceed the maximum wattage rating of the smp without extensive modifications as mentioned above.
Usually not worth the effort as smp's are relatively cheap.

 

Based on my research current doubler can also minimize ripple current

 

Good day, can we add a current doubler to a non-isolated SPMS topology like buck-boost?

From the introduction in your document:

The current doubler rectifier is a popular alternate choice for the output stage of a buck
derived power converter, which would otherwise use a conventional center-tapped
transformer with secondary-side, full-wave rectification.​

So now that we have some understanding of your question, the answer is "maybe".

Whether it can be adapted to a buck-boost topology, depends on which definition of buck-boost you are using. In one use of the term the energy is transferred to the load when the switching device is off, and I don't see it likely that the current doubler rectifier can be adapted to that kind of buck-boost. The other buck-boost topology has both a buck switch and a boost switch. There is some hope of adding this to the buck section, but I have not seen that done.