Best Practices for Storing Large Conversion Tables in AI Prompts

Can any Clay Expert here tell me how to solve this:

1.
Problem: Where do I store large "conversion tables" for AI prompts or formulas to access them?
2.
Case: I want to categorize 4 digit SIC Codes into their 2 and 3 digit titles
3.
Current approach: I have a json file that returns the correct values for each 4-digit code as an input
4.
Current issue: When i paste the json content into a text cell it exceeds the cells file size

I want AI to access these json data in order to correctly categorize it