Can anyone please advise how I add a window contact to this type of window frame, as you can see there is a big step between the window and frame
Hi @AshTug. We have a Help Center Article here that may have some tips to help you install a Contact Sensor on different windows and doors. Other neighbors may also chime in if they have installed Contact Sensors on a similar frame! 
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Just stick them on mine works fine with almost a 1-inch gap/step between the sensor and magnet. Just test it on your phone (check it shows the window/door as closed on the installed position) before committing to sicking it on there I guess.