ESP32 file system image in production

Other Hardware Storage
1

I use Visual Studio Code and PlatformIO to develop firmware for ESP32.
As you know, in order to place files inside the flash you have to put them into a data folder, then build and upload the file system image.

Inside the SPIFFS partition I store the web pages and the certificates for SSL.
Of course the certificates are different for each unit.

I wonder which is the recommended way to customize the content of the SPIFFS partition in production. Let's say for 100-500 pcs.

Using the procedure above can work but it takes too much time.
Is there a way to add and upload a file directly? At least, without the need to have all the others file contained in the data folder.

Any suggestion is appreciated.

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