People come to this site with all sorts of requests.
Can you tell us the capacitance and voltage of the three electrolytic capacitors? If any have a voltage rating of over 200 V, it is a switch mode power supply.
The design of transformers in SMPSs are so dependent on the design of the electronics that it isn't possible to have standard ones.
A conventional transformer's design really depends on the power and the output voltage only, so manufacturers can make a range of powers, and in each power rating a range of voltages. They might make 100 different types, and they can test each type and put the results in the data sheets.
On an SMPS transformer, there are loads of other considerations, such as switching frequency, what auxiliary windings are needed, how much stray inductance there is. That makes it just about impossible for there to be standard designs, and the power supply manufactures would probably want to change the transformer designs during development.
What you can get are the ferrite cores, such as this
https://www.farnell.com/datasheets/80931.pdf which you can get from
https://in.element14.com/1422748. It then need windings, and suitable insulation.
Designing the windings on a transformer like that is complicated. When I tried, the largest problem was stray inductance, and the better coupling of the auxiliary winding that the secondary to the primary.