In namespace %SYS you have the utility ^JRNDUMP which displays the content of journal files in "readable" text format.
You may need to adapt it to your requirements.
Journal: c:\intersystems\cache\mgr\journal\20190808.004
Address Proc ID Op Directory Global & Value
===============================================================================
131088 6600 S c:\intersystems+ %SYS("SERVICE","ECPCluster") = 0
131152 6600 S c:\intersystems+ %SYS("LASTSESSIONGUID") = "5ª"_$c(9)_"+
131224 6600 BT
131240 6600 ST c:\intersystems+ %SYS("SERVICE","ECPSessionVersion") = 2
131316 6600 CT
131644 10960 S c:\intersystems+ SYS("LastLicenseKey") = "LicenseCapaci+
132620 2600 S c:\intersystems+ SYS("Security","UsersD","unknownuser") 132692 10960 K c:\intersystems+ SYS("CLMANAGER")
132740 10960 S c:\intersystems+ SYS("CLMANAGER") = 1
132792 10960 S c:\intersystems+ SYS("CLMANAGER",1) = $c(127,0,0,1,15)_+
132848 10960 S c:\intersystems+ SYS("CLMANAGER",1,"started") = 1
Depending on your activities in the DB this may take many many GB !
I'd suggest examining the content first from Mgmt Portal to see if this is what you expect.