See:
https://community.hubspot.com/t5/APIs-Integrations/Why-is-there-no-abort-controller-exposed-for-serverless-requests/m-p/1174436#M83111
This is a huge oversight. How cards have been up for as long as they have and this isn’t added is beyond me much less how it was put out without this as a first principle.
Complete and utter lack of foresight