Hi,
I recommend you upgrade to SCOM 2022 directly.
Indirect upgrade to SCOM 2019 -> SCOM 2022
SCOM 2012 R2 -> SCOM 2016 -> SCOM 2019 -> SCOM 2022
SCOM 2012 R2 -> SCOM 1801 -> SCOM 2019 -> SCOM 2022
SCOM 2019 Step-By-Step: Upgrading
Upgrading System Center Operations Manager
https://learn.microsoft.com/en-us/system-center/scom/deploy-upgrade-overview?view=sc-om-2022