https://docs.github.com/en/graphql/overview/explorer

issues in users public repos even if not assigned to user

query($userLogin: String!) {
  user(login: $userLogin) {
    repositories(affiliations: [OWNER], last: 100, privacy:PUBLIC) {
      edges {
        node {
          url
          issues(states: [OPEN], last: 100) {
            edges {
              node {
                createdAt
                title
                url
                viewerDidAuthor
                repository {
                  name
                }
              }
            }
          }
        }
      }
    }
  }
}

based on this
https://stackoverflow.com/questions/49078788/using-github-api-v4-graphql-to-find-all-open-issues-belonging-to-repositories-ow

jq query

.data.user.repositories.edges[].node.issues.edges[].node | { url, title }