The purpose of this plugin , make button appear like tihis “?” next to field if custom field needs to be explained, in the form of internal create or is to show a description button like this 
next to any custom field that needs explanation, It can be used in both Jira internal and service desk portal create screen. Description is added and if the language of the field is English or Turkish, the description is visible.
We have two language options here; English and Turkish. you can write your comment in the field of your language. Description will be added and it can be seen when you go to the button.
In order to accomplish this, the field to be added to the description is selected from the custom field.
...
Click Go on Custom Field screen. hen click on "Add smart description" by going to the Settings section in custom field section.
...
After doing this process, you will see a ready json format as below. From here, "?" and where you want the description to appear, you can make it appear by typing "true" in that field.
...
After saving in this way, a create screen like below will be created. "?" Here you can choose where to show the description by writing “true” or choose not to show by writing “false”.
...
After saving, you will see the smart description next to the custom field. Next to the custom field. Explanation appears when you go next to it.
...
You should write the explanation description field in which language do you use. Here we have two language option , “en” is English and “tr” is Turkish. Since the language we use is English because of this, we should write after “en” “..” section, there has been an adjustment in that area. You can see the screenshot below for an example.
...
You can see the description by hovering over the next to the custom field An added comment can be displayed by hovering over.
...
The added decription can be edited at any time, or the field to be displayed as below will be selected by selecting "false" and "?" appear to be removed.
...
As it is seen, after this process is saved, a description will be displayed on the create screen.
...
You can edit the description you added previously, and make it disappear by writing “false”.
...
After you save, you will see that the description disappeared from the custom field.
...