Study of JK07 in Patients With Heart Failure and WHO Group 2 Combined Post- and Pre-Capillary Pulmonary Hypertension

Key Inclusion Criteria: * Participants with HF New York Heart Association Class II-III. * Participants will be classified as having HFrEF (LVEF ≤ 40%) or HFpEF (LVEF \>40% and ≤70%). * Right heart catheterization (RHC) based evidence of cpcPH: * PVR ≥2.5 WU; AND * mPAP ≥25 mmHg; AND * PAWP ≥16 mmHg Key Exclusion Criteria: * Diagnosis of PH in World Health Organization (WHO) Group 1, WHO Group 3, WHO Group 4, or WHO Group 5. * Contraindicated to RHC that can be left in place for approximately 6 hours. * A diagnosis of pre-existing lung disease including congenital abnormalities, full or partial pneumonectomy, or previous therapeutic radiation of lungs or mediastinum. * Body mass index (BMI) \>45 kg/m² at screening.