How can I forward json data with header?

[kiwibenis]

I am trying to get a json formated file into splunk. The file is being forwarded from a UF with monitor, it contains data from aircrafts (ADS-B Data). This is a sample:

{ "now" : 1667769466.071,
"messages" : 58728034,
"aircraft" : [
{"hex":"8963e3","type":"adsb_icao","flight":"UAE3KE ","r":"A6-EPT","t":"B77W","alt_baro":35000,"alt_geom":34475,"gs":526.3,"ias":281,"tas":486,"mach":0.828,"wd":241,"ws":45,"oat":-46,"tat":-15,"track":91.85,"roll":-0.35,"mag_heading":93.69,"true_heading":94.78,"baro_rate":0,"geom_rate":0,"squawk":"7313","emergency":"none","category":"A5","nav_qnh":1013.0,"nav_altitude_mcp":35008,"nav_heading":94.92,"lat":52.301067,"lon":1.596706,"nic":8,"rc":186,"seen_pos":0.864,"r_dst":186.487,"r_dir":295.3,"version":2,"nic_baro":1,"nac_p":9,"nac_v":1,"sil":3,"sil_type":"perhour","gva":2,"sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":24165,"seen":0.9,"rssi":-25.1},
{"hex":"47a531","type":"adsb_icao","flight":"NOZ7YW ","r":"LN-NGS","t":"B738","alt_baro":33000,"alt_geom":32400,"gs":468.2,"ias":258,"tas":430,"mach":0.732,"wd":221,"ws":41,"oat":-46,"tat":-22,"track":37.19,"track_rate":-0.22,"roll":-5.45,"mag_heading":35.86,"true_heading":36.99,"baro_rate":0,"geom_rate":0,"squawk":"1410","category":"A3","nav_qnh":1013.6,"nav_altitude_mcp":32992,"nav_altitude_fms":33008,"nav_heading":35.16,"lat":52.396033,"lon":1.734820,"nic":8,"rc":186,"seen_pos":10.505,"r_dst":184.026,"r_dir":297.5,"version":2,"nic_baro":1,"nac_p":9,"nac_v":1,"sil":3,"sil_type":"perhour","gva":2,"sda":2,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":8664,"seen":6.8,"rssi":-30.0},
{"hex":"484b91","type":"adsb_icao","flight":"KLM1293 ","r":"PH-BGK","t":"B737","alt_baro":40000,"alt_geom":39400,"gs":457.5,"ias":241,"tas":466,"mach":0.796,"wd":229,"ws":32,"oat":-47,"tat":-19,"track":304.94,"track_rate":-0.03,"roll":-0.18,"mag_heading":300.06,"true_heading":301.14,"baro_rate":32,"geom_rate":-64,"squawk":"6260","category":"A0","nav_qnh":1013.2,"nav_altitude_mcp":40000,"lat":53.694841,"lon":1.827527,"nic":8,"rc":186,"seen_pos":4.051,"r_dst":224.752,"r_dir":316.3,"version":0,"nac_p":8,"nac_v":0,"sil":2,"sil_type":"unknown","alert":0,"spi":0,"mlat":[],"tisb":[],"messages":4336025,"seen":2.2,"rssi":-30.0},
{"hex":"406754","type":"adsb_icao","flight":"EZY36HD ","r":"G-EZWC","t":"A320","alt_baro":38000,"alt_geom":37900,"gs":420.8,"track":320.79,"baro_rate":-256,"squawk":"5730","category":"A3","lat":49.963852,"lon":1.830091,"nic":8,"rc":186,"seen_pos":49.821,"r_dst":179.161,"r_dir":250.1,"version":2,"nac_v":1,"sil_type":"perhour","alert":0,"spi":0,"mlat":[],"tisb":[],"messages":122526,"seen":31.2,"rssi":-27.9},
{"hex":"400f99","type":"mode_s","r":"G-DBCJ","t":"A319","alt_baro":23000,"alt_geom":22625,"gs":475.2,"track":69.81,"baro_rate":0,"nac_v":1,"alert":0,"spi":0,"mlat":[],"tisb":[],"messages":11,"seen":2.3,"rssi":-31.1}
]
}

How can I get every line (starting with "hex") in a seperate event and all fields extracted?

Idealy the timestamp of every event is the one from the header line 1 named "now".