Update: Or just use https://the.rip/ 🤦♀️
Step 1: Sign up to Readwise.
Readwise is an app that makes it easy to save and store tweets and other online content (such as Kindle highlights).
Step 2: Connect your Twitter account to Readwise here.
Step 3: Save a tweetstorm by replying to the tweet with @readwiseio save thread
Step 4: Go to your Readwise Library > Tweets and click Export Highlights
This exports the tweetstorm as a markdown file.
Step 5: Create a new Page in Craft and paste the contents of the markdown file.
Note: The Craft team will likely add Readwise integration sometime in the future. Add your vote here.