Category: Nios® II
Tools: Nios® II EDS
device:-

Below is a summary of the steps.
1. Set SBT to output hex to write to on-chip-memory.
2. Build SBT will generate qip as well as hex.
The location of hex is described in qip.
3. Reload qip into Quartus II and compile.

For details, please refer to the document at the URL link below, 5.4.2.1 Creating Memory Initialization Files.
https://www.intel.com/content/www/us/en/docs/programmable/683525/21-3/creating-memory-initialization-files-87154.html