How to split json in two parts

Hello i have below json format
@ppr @Anil_G @supermanPunch
{

“testExecutionKey”: “P003324-384”,
“tests”: [
{
“status”:“PASS”,
“testKey”:“P003324-88”,
“start”:“2023-02-13T16:59:03+01:00”,
“finish”:“2023-02-13T17:12:17+01:00”,
“executedBy”:“abc”,
“defects”: ,
“evidences”: ,
“steps”: [
{
“status”: “PASS”,
“defects”: ,
“evidences”:
},
{
“status”: “PASS”,
“defects”: ,
“evidences”:
}
],
“assignee”: ,
“testEnvironments”: ,
“iterations”: ,
“comment”:“”
},
{
“status”:“PASS”,
“testKey”:“P003324-254”,
“start”:“2023-02-13T16:59:05+01:00”,
“finish”:“2023-02-13T17:13:08+01:00”,
“executedBy”:“abc”,
“defects”: ,
“evidences”: ,
“steps”: [
{
“status”: “PASS”,
“defects”: ,
“evidences”:
},
{
“status”: “PASS”,
“defects”: ,
“evidences”:
},
{
“status”: “PASS”,
“defects”: ,
“evidences”:
}
],
“assignee”: ,
“testEnvironments”: ,
“iterations”: ,
“comment”:“”
}
]
}

i am facing below issue
1] i have provided less json but we are getting very big json files and we need to do http call by passing this json in body
2] when we pass big json we are getting error in call so we split manually if you see in above json one test execution key and below that 2 test keys are there.
image
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3] if suppose 100 test keys are there then i need to split file with 1 file with 50 test key which includes tesexckey only once at start and same second file with rest of the 50 keys.
if that also not work then need to split into 3 parts .
how can i achieve this?
consider above example there are 2 test keys and 1 test execution key i need in below format
1 st file ]
{

“testExecutionKey”: “P003324-384”,
“tests”: [
{
“status”:“PASS”,
“testKey”:“P003324-88”,
“start”:“2023-02-13T16:59:03+01:00”,
“finish”:“2023-02-13T17:12:17+01:00”,
“executedBy”:“abc”,
“defects”: ,
“evidences”: ,
“steps”: [
{
“status”: “PASS”,
“defects”: ,
“evidences”:
},
{
“status”: “PASS”,
“defects”: ,
“evidences”:
}
],
“assignee”: ,
“testEnvironments”: ,
“iterations”: ,
“comment”:“”
}
]
}

2 nd file ]
{

“testExecutionKey”: “P003324-384”,
“tests”: [
{
“status”:“PASS”,
“testKey”:“P003324-254”,
“start”:“2023-02-13T16:59:05+01:00”,
“finish”:“2023-02-13T17:13:08+01:00”,
“executedBy”:“abc”,
“defects”: ,
“evidences”: ,
“steps”: [
{
“status”: “PASS”,
“defects”: ,
“evidences”:
},
{
“status”: “PASS”,
“defects”: ,
“evidences”:
},
{
“status”: “PASS”,
“defects”: ,
“evidences”:
}
],
“assignee”: ,
“testEnvironments”: ,
“iterations”: ,
“comment”:“”
}
]
}