2020.1

You can replace 'myProperty' and 'myvalue' with whatever name and value best suits the use
case.
If the name of the property contains a space you'll need to put it between brackets and
quotation marks:
contentitem.properties['name with spaces'] = 'value';
If the value is a number you don't need to put it between quotation marks:
contentitem.properties.custom_property = 123;
context
In a Control Script, the context object represents one context in the template.
Which contexts are available in the template can be queried using merge.template.contexts.
The context being merged can be queried using merge.context.
Field Type Description
sections Array
Array of sections (see "section" on page1400) inside a
particular context defined in the template.
Note: When using merge.context.sections keep in mind that
for example 'Section X' might only exist in your Print context,
so using merge.context.sections['Section X'] without
enclosing it in the if statement if (merge.context.type ==
ContextType.PRINT) {} will yield an error when the script
runs for other contexts.
Alternatively, use the template object to access a specific
context: merge.template.contexts.PRINT.sections
['Section X'].
type "ContextType"
on page1388
The context type: PRINT, EMAIL or WEB.
Page 1392