I think what you are looking for is:

> cleos --url https://eos.greymass.com get actions eosio.ram  -1 -20

The above command would give you the last 20 transactions in the account *eosio.ram*

To consume the result in JSON add *--json* flag

> cleos --url https://eos.greymass.com get actions eosio.ram  -1 -20 --json