Is it possible to create a dissector for Wireshark in C in Visual Studio 2019 IDE and add it to the wireshark source code?

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Usbcap is added as .exe in extcap. I have a custom .exe file to capture serial data. Can I know the procedure to add .exe in extcap like usbcap.

Extcap utilities only provide an extended capture mechanism for Wireshark. They do not dissect the data, that is the work of a built-in or plugin or even a Lua dissector. Usbcap is not an an extcap interface, it's not integrated with Wireshark. USB traffic (on Windows) is captured by USBPcapCMD either to a file that is subsequently opened by Wireshark or by piping its output to Wireshark.

Extcap interfaces are discussed at the link in the answer.

I have my own extcapture which captures the serial port data that should be subsequently opened by wireshark in a similar way to USBPcapCMD. How do i proceed with this ?

In that case you should arrange your capture utility to output pcapng format data, either to a file or to standard output, either of which can be subsequently read by Wireshark.