It’s called being an adult and a parent - all parents if they work or not do it
Many parents (myself included as DH and I both work FT) contract out many of the jobs a SAHP would do. Eg a childminder for school runs. Breakfast club, after school club and holiday clubs. A cleaner to do a thorough clean every week plus the laundry.
Some people have a gardener or even an accountant (say you run your own business).
Ironing is often contracted out. Night nanny for babies/toddlers so working parents get sleep is common in some areas.
Ideally I’d like to work part time as 2 out the house FT parents is a constant juggling act, especially with covid waves and when children are ill or their class has to isolate etc. I’d also like to plan and make proper meals from scratch instead of relying on frozen food, remembering to marinate something the night before in a rush etc.
I think being a SAHP can be treated like a job, if you focus on your DC’s needs, education, development, nutrition etc. And if you take on the cleaning (or the hassle of finding cleaners), cooking, shopping, household admin. If you have goals eg improving the running of the home, or supporting your working partner to get a promotion, or focusing on your DC’s education and homework it can be viewed as a FT job. It depends how you look at the role.