Add annotations for returned data #1035

Job	Run time
linters (3.9, ubuntu-latest)	1m 45s
Testing on Python 3.8 (ubuntu-latest)	1m 43s
Testing on Python 3.8 (macos-13)	4m 44s
Testing on Python 3.8 (windows-2019)	2m 43s
Testing on Python 3.9 (ubuntu-latest)	1m 49s
Testing on Python 3.9 (macos-13)	2m 57s
Testing on Python 3.9 (windows-2019)	2m 40s
Testing on Python 3.10 (ubuntu-latest)	1m 46s
Testing on Python 3.10 (macos-13)	2m 29s
Testing on Python 3.10 (windows-2019)	2m 56s
Testing on Python 3.11 (ubuntu-latest)	1m 48s
Testing on Python 3.11 (macos-13)	2m 34s
Testing on Python 3.11 (windows-2019)	2m 22s
Testing on Python 3.12 (ubuntu-latest)	1m 56s
Testing on Python 3.12 (macos-13)	3m 56s
Testing on Python 3.12 (windows-2019)	6m 13s
	44m 21s

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