How to search and replace in linux using wild card in search and original string in the replace (using sed)?

Question

I'm trying to do a search and replace using sed and wild cards. The search part seems to be working but the replace is using a string literal instead of regex.

How do I search and then use the found string as part of the replace?

For example if I have strings that end with something like the following:

valueset-nachc-a0-de2
valueset-nachc-b9-de12345

I can find the strings I'm looking for with something like the following:

grep -r "https://nachc-cad.github.io/hiv-cds/resources/hiv-cds/vocabulary/valueset/generated/valueset-nachc-[a-z][0-9]-de[0-9]*"

But if I use the sed below I get the string shown. How do I get the original string + ".json" so the ouput contains the following?

find . -type f -exec sed -i 's/https:\/\/nachc-cad.github.io\/hiv-cds\/resources\/hiv-cds\/vocabulary\/valueset\/generated\/valueset-nachc-[a-z][0-9]-de[0-9]*/https:\/\/nachc-cad.github.io\/hiv-cds\/resources\/hiv-cds\/vocabulary\/valueset\/generated\/valueset-nachc-[a-z][0-9]-de[0-9]*.json/g' {} +

Output:

valueset-nachc-[a-z][0-9]-de[0-9]*.json

Desired output

valueset-nachc-a0-de2.json
valueset-nachc-b9-de12345.json