No, allStrapiJobs appeared in the Explorer panel of localhost:8000/___graphql after I had created the content type of Job in the Strapi admin and connected Gatsby with Strapi by adding the following in gatsby-config.js:
{
resolve: gatsby-source-strapi,
options: {
apiURL: http://localhost:1337,
queryLimit: 1000,
contentTypes: [jobs, projects, blogs],
singleTypes: [about],
},
},