Syntax for "Display Dependent On" and the "Mandatory Dependent On"

Can someone point me a resources that details the syntax for “Display Dependent On” and the “Mandatory Dependent On”.

Objective is to display mandatory field based on the state of two other field.

~~ eval:(doc.datadoctype1 != null && doc.checkdoctype == 1) ~~

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I believe you can only check field configured or not in “mandatory Dependent On”
field value check is not supported will work‘xxx’ is not working

eval:parent.project.agile == 1 && parent.select_sprint!=null; is it right or not?

if project is link field in parent doctype and select_sprint is also one filed and I insert this to display one field in my child table.