Hi Can I access value of constant in Plugin without passing it

You can use the below if you have the constant's UUID.
          
          Constant cons = (Constant) contentService.getVersion(contentService.getIdByUuid(constantUuid), ContentConstants.VERSION_CURRENT);
          
If you don't have the UUID, then you can put the constant in a dummy application and then look at the export log to get the constant's UUID.