How can I convert a parsed json file from json then back to json?

Dear Community

I am generating a parsed JSON file using powershell ConvertTo-Json.
Everything is fine until here, because now I want to convert it from json, use the values and then convert it back to json with the values like they were before.
But when I convert the file back to json, it only shows null for the values...
Is there any way to solve this?

Here is my code for creating the parsed file:

$secFile = "C:\some\folder\creds.json"
$in = Get-Content $secFile | ConvertFrom-Json
[ordered]@{
pcname='ENTER HERE';
share='\\$in.pcname\C$';
filename='ENTER HERE';
destfilepath='Scripts\Cert';
destfile='$in.share\$in.destfilepath\$in.filename';
RDdestfile='C:\$in.destfilepath\';
Username="ENTER HERE";
Password="ENTER HERE";
EncryptedPassword=""
} | ConvertTo-Json | Foreach {[System.Text.RegularExpressions.Regex]::Unescape($_)} | Out-File "$secFile"

Here is the code for converting the file back to json:

[ordered]@{
pcname=$in.pcname;
share=$in.share;
filename=$in.filename;
destfilepath=$in.destfilepath;
destfile=$in.destfile;
RDdestfile=$in.RDdestfile;
Username=$in.Username;
Password="";
EncryptedPassword="$secString"
} | ConvertTo-Json | Out-File "$secFile"

and here is the file after converting it back to json:

{
"pcname": null,
"share": null,
"filename": null,
"destfilepath": null,
"destfile": null,
"RDdestfile": null,
"Username": null,
"Password": "",
"EncryptedPassword": "01000000d08c9ddf0115d1118c7a00c04fc297eb010000006f6d3ce161a681428efe68b51827a6640000000002000000000003660000c0000000100000002a6a1ff60cb280662a9578cb47926a4d0000000004800000a000000010000000a65a1cd7137935dbfcd22bcdc685f52a20000000b87554b4f6f6dbe655cd525a894e1c7d1180b4db121385e57b218fa772ad1d441400000048453bb6e137ed437de3e4ecbd855429ddfc1fba"
}

This worked before I parsed the file. So that can't be the error, right?

I'm neither a powershell or json pro, so I really am hoping for good help

Greetings

Martin