Return `subscription` for `on` method #6378

Job	Run time
Code Hygiene	2m 24s
Build tests (ubuntu-latest)	4m 8s
Integration tests (ubuntu-latest)	5m 25s
Build tests (windows-latest)	4m 49s
Integration tests (windows-latest)	7m 33s
Render tests (ubuntu-latest, 0)	9m 56s
Unit tests and Coverage	2m 11s
Render tests (ubuntu-latest, 1)	9m 51s
Render tests (ubuntu-latest, 2)	8m 9s
Render tests (windows-latest, 0)	11m 46s
Render tests (windows-latest, 1)	11m 35s
Render tests (windows-latest, 2)	8m 40s
	1h 26m 27s

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