To obtain the "Story Points" for a given issue the field will appear as "customfield_<id>". and you would need to aggregate the issue data from the field to the sprint the issue was in.
However, the issue comes with committed and completed aspect as data for story points lives on the issue not in the sprint, as the actual points are tied to, and live in the issue data directly so the committed and completed points are calculated in a different process through aggregating the issue data in the sprint reports so there is no field data to be pulled for the aggregated data, and there are not currently any options in the API to pull a sprint report data.
I recommend checking out the following threads. There are some concepts in the following Threads on how to accomplish this with various other means such as creating a plug-in and using the JAVA API, but in the first one there is a link to a git-hub repo where a user posted some scripts to create external sprint reports using google sheets to pull and collate the data that looks like a really good solution direct link to that repo here:
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