Is it possible to generate customized fields for tasks or Milestones

Is it possible to generate customized fields for tasks or Milestones

Is it possible to generate customized fields for tasks or Milestones? I need to add either additional information that does not need to be provided a search function, thus filtered. An example is a piece of information regarding how the task will be monitored ( indicator).  The other field would be possible to search using the filter function, the field would have a drop down and the option to select one or more fields ( labels) to a task. an example is the name of the donor supporting the task ( project- more than one donor can support a task or project).
You mention in a previous thread that you were working on a function to provide custom fields (https://help.zoho.com/portal/en/community/topic/add-custom-field-in-a-task); did this get anywhere?