Hello Xiaobo,
Thank you for your patience while we were reviewing the request with our development team!
As a result of the discussion and recent research on the behavior, I can inform you that the HTML inputs with the type "radio" and "checkbox" can be configured as read-only. As said in the official MDN documentation about the read-only attribute - "Only text controls can be made read-only, since for other controls (such as checkboxes and buttons) there is no useful distinction between being read-only and being disabled, so the readonly attribute does not apply."
Having this in mind, I am marking the request as "Declined".
As possible alternative approaches, you can refer to this StackOverflow discussion.
Regards,
Tsvetomir
Progress Telerik