ESP32 Arduino has set the IDF parameter to use malloc() for new operator.
It will use HEAP (DRAM) when the size of the allocated data space is lower than 4KB, otherwise, it will allocate it from PSRAM, whenever it is enabled in the Arduino IDE Tools Menu.

sdkconfig settings:
CONFIG_SPIRAM_USE_MALLOC=y
CONFIG_SPIRAM_MALLOC_ALWAYSINTERNAL=4096

References:
https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/api-guides/external-ram.html#provide-external-ram-via-malloc
https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/api-reference/kconfig-reference.html#config-spiram-malloc-alwaysinternal