Be honest on your CV and in the interview, if they didn’t want employees from other departments to move onto the flight deck them they would not have an internal pilot recruitment scheme.
The biggest problem might be how well you perform in the non flying job, for instance good ops officers are hard to find, if you work hard and perform to an excellent standard in ops your boss might not want to let you go.
Conversely if you’re no good then you won’t get a good recommend for the flight deck job so you have to be good enough to get a good reputation and decent recommend from your boss but not so good that your non flying boss can’t do without you.