In "HOWTO: download separate elf/srec/hex file to microcontroller using S32 Design Studio" a Flash Configuration option under option 1 to flash a MCU with a compiled binary.
This option however seems to be missing in the version of Design Studio I'm using:
S32 Design Studio for S32 Platform
Build id: 201217 (Update 3)
OS: Windows 10, v.10.0, x86_64 / win32
Java version: 1.8.0_202