In addition is there anything like webview in android?
Please suggest the best practice to do it. Thanks in advance.
I would just create a dialog window UI with Unity UI, probably also make it a prefab as well, and set its style as needed. So for example a Panel for the background of it all, a Text for title, an optional Image for a separator, another Text component for the content, and 2 Buttons for OK and Cancel functionality.
For referencing resources you can use other Buttons with a transparent image component (leaving just the Text), and calling Application.OpenURL() when clicked.
As far as I know there is no built-in webview functionality in Unity, but this project seems promising.