I'd say: No.
M.2 PCI-E add-on cards are usually full height, while your server rack is 1U and supporting only low-profile PCI-E cards, in 90 degree angle compared to MoBo.
Direct link if image doesn't load:
https://lenovopress.lenovo.com/assets/images/LP1049/SR630-rear.png
Only way to use M.2 PCI-E add-on card without riser, is when you don't have the server in the rack and it's top panel is open.
Direct link if image doesn't load:
https://lenovopress.lenovo.com/assets/images/LP1049/SR630-internals.png
Source:
https://lenovopress.lenovo.com/lp1049-thinksystem-sr630-server
But this will mess up the airflow path within the server, making it's CPUs most likely to overheat and cook themselves.