I don’t think I’ve ever even proffered “passion” about software development or whatever random B2B SaaS vertical the company was doing.
I show proficiency, professionalism, expertise, and the ability to bring that to a job.
I’ve had 10 jobs everything from startups, random big enterprise, and BigTech.
Am I suppose to show passion about - bill printing? Field services sending technicians to people’s houses? Railroad car repair?
Admittedly my first job as an architect was for a company that managed sending nurses to the homes of special needs kids and the next two were in the health care industry, but after that it was dealing with cloud consulting (full time jobs) first at AWS directly then other consulting companies (currently a staff architect at a 3rd party cloud company)
I can talk about technical solutions, be a post sales architect, lead implementations and do system design and coding all day long without being “passionate” about the business. It’s just professionalism and my addictions to food and shelter
Passion can show itself in many ways. Why did you pick programming of all things? There's something there, right? If you can dig into a topic, that's a form of passion. If you're willing to put in hard work, that's a form of passion. These may not be the same thing as the person who gets excited about these problems, but something did drive you. And no one is so excited about coding that they are never dispassionate and never frustrated. The thing you're looking for is why should I trust that you have these skills? If there's nothing you can rant about, then I'd find that odd, even if you see it as a paycheck.