I have created custom fields in 3 different options.
1. Mapped to the custom table created via phpadmin
2. stored in the custom table via the provided options in the settings panel of custom fields
3. without storing in the custom table
The page designing via oxygen builder not shown the custom fields created via the option 1 and 2. however, option 3 shown and functioned well.
Relation to the above query, I have created a shortcode via MB Views to display the custom fields stored in the custom table. If I use shortcode, the oxygen Builder displays the custom field data from the custom table.
Then, I have to create an MB Views shortcode for concern custom fields to use in the oxygen page template.