Get the STATS INEQUALITY extension command. You can install it from the Extensions > Extension Hub menu. It provides Gini and a number of other measures.
This package requires the appropriate version of R and the R Essentials for your Statistics version and platform. However, the authors of the R DescTools package used by this extension have made a number of changes to that package that might be incompatible with your Statistics version, so you might need to get an older version of that if running the procedure fails.
#SPSSStatistics#Support#SupportMigration