How can I update a custom property on activity entity from OFSC plugin ?

Summary:

whts the best way to update a custom property defined at entity ( activity ) from ofsc plugin , (by not using OFSC API calls) ?.

Is close and update methods in plugin framework can be used for this .

Content (please ensure you mask any confidential information):

scenario like - setting a custom property to YES or No from plugin

Version (include the version you are using, if applicable):

24

Code Snippet (add any code snippets that support your topic, if applicable):