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I did it once that way: Filter on every packet that has set one of these Flags active: SYN, RST or FIN

Then Apply a column on that Flags and one fpr the ACK Flag. After that you can export that view as an CSV file.

And when you import that file to for example to EXCEL you can count with a macro the number of concurrent sessions and that number you can draw.

This can be a solution. You also can try it in anotehr way by using tshark and some shell environments like powershell or bash. But Wireshark itsself can´t help you at the moment with that question. As there is no explicit field that counts that number.

Hope this answer helps you.