Nested Json array extraction using logstash

I working some tricky log and it contain nested array with json formate. Each array contain same fieldname. I want to show those fieldname and count on vertical graph

Single event
{"bridgeNemoDataType":"rally-testcase-details","rallyTestCaseData":[{"tccount":5,"projectTestName":"E_SiriusA"},{"tccount":2,"projectTestName":"E_Rigel"},{"tccount":10,"projectTestName":"E_Tsunami"},{"tccount":4,"projectTestName":"E_Avengers"},{"tccount":14,"projectTestName":"E_Team Titans"}]}

I want to show like this,

x-axis : project name,
Y-axiz : count

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