IMHO: Workflow, Text input fields and File formats are like APIs; if there is a way to abuse, hidden or public, then someone will use that in their process (https://xkcd.com/1172/). So adhering to Org mode in your own parser will mean a lot of work anyway. There will always be some subtle point that make your format incompatible with a tool you want to use.
My weekly todos look something like this:
It uses a simialr format:
YYYYMMDD
- Task to be done
/ Task started/half donex Task completed
ie:
20220328
- finish baselining instances for ami creation
/ verify routes exist for all subnetsx snapshot instance X before users are added
-- Dave