How to get transactions for the contract in json format

[subhasisbanik]

I am running the setup with,
yarn start -f 4000000 -a 0x722dd3F80BAC40c951b51BdD28Dd19d435762180 -n "http://localhost:8545" -l "debug" -s storage -o terminal
For a ropsten testnet and would like to the transactions for this address stored in json format.
I see that we can use graylog for it but I am not sure how and where it is storing the data as mentioned in json format. I have modified the above command to
yarn start -f 4000000 -a 0x722dd3F80BAC40c951b51BdD28Dd19d435762180 -n "http://localhost:8545" -l "debug" -s storage -o graylog
But did not find any folder which stores such json.
Also I saw in the README that, we need to run Docker container for the Graylog but did not find any steps specific to this setup.
Could you please help?