Inclusion Criteria:

* Must be a candidate for standard of care (SOC) treatment of non small cell lung cancer (NSCLC) by concurrent platinum-based doublet chemotherapy with radiation therapy (cCRT) followed by consolidation durvalumab treatment as determined by the investigator and per local guidelines at screening
* Have a medical history of pathologically (histologically or cytologically) proven diagnosis of NSCLC within 3 months prior to enrollment/randomization
* Have locally advanced unresectable stage IIIA or IIIB NSCLC according to the eighth edition lung cancer stage classification
* Have at least 1 target lesion (primary lung lesion or involved lymph node[s]) per RECIST version 1.1 that is amenable to intratumoral and/or intranodal injection and external beam radiation therapy (EBRT) as determined by the investigator at screening
* Have an eastern cooperative oncology group (ECOG) performance status of 0 to 1

Exclusion Criteria:

* Medical history of: (a) Primary immunodeficiency (b) Organ transplant that requires therapeutic immunosuppression
* Any of the following within 3 months prior to enrollment/randomization: severe or unstable angina, myocardial infarction, major thromboembolic events, clinically significant ventricular arrhythmias or heart failure new york heart association functional classification class III to IV
* Another concurrent or prior primary malignancy (other than NSCLC) within the last 36 months at informed consent
* Known allergies, hypersensitivity, or intolerance to any ingredients of JNJ-90301900 crystalline solution, platinum-based doublet chemotherapy (ChT), or durvalumab
* Active bleeding diathesis or requirement for therapeutic anticoagulation or antiplatelet that cannot be interrupted or altered for procedures