If you just want to see a list of the system prompts available, then use this link:
When you mention number in a queue do you know you can use the Create Generated prompt step to generate numbers for this without directly referencing the system prompts? This might not be relevant to what you are trying to do but I thought it was worth mentioning.
You can also use the CLI to list file using the file uccx list prompt_file command - example below.
admin:file uccx list prompt_file system/G711_ULAW/en_US/*
dir count = 7, file count = 22