no easy way to log the SSIS logging to sql server agent log.

one way would be to change the job to execute a cmd file containing 2 steps

step 1 - the dtexec command line - writting the contents of the DTEXEC output to a file, and having the ssis package logging to another file.

step 2 - cat/print/type the contents of both files to standard output. it will then be displayed on the agent log.

not using sql server agent logging

another solution is to output the logs to a Sql server table and get the DBA's to give you select to that table.

- one issue with this is that by default the ssislog table truncates the message text to 4k chars if not mistaken.

yet another solution, and this is quite common is that you do output to files and you get read permission to the folder containing the logs.