[
   {
      AccountNumber=123456,
      Amount=257710.06
   },
   {
      AccountNumber=845679,
      Amount=3672351.06
   }
]

<choice doc:name="Choice">
        <when expression="#[flowVars.investOneList.contains(123456)]">
            <logger message="Account number is present" level="INFO" doc:name="Logger"/>
        </when>
        <otherwise>
            <logger message="Account number is not present" level="INFO" doc:name="Logger"/>
        </otherwise>
    </choice>