GA4, Search Console and BigQuery data can be viewed together. A blend joins tables using configured fields and operators; it does not reveal identifiers that the source data never supplied.
For example, a page-and-date comparison can show search visibility beside on-site activity. It cannot identify the exact search query that led an individual to purchase. If totals increase after a join, inspect duplicate keys and aggregation levels.
Organize an SEO report around decisions: search performance, landing pages, branded searches and meaningful actions. Check filters, access permissions and source totals. Build time and usefulness depend on the data and reporting requirements.