Попробовал указать:
"Data Source=.\CA;
"Data Source=UC-TEST1-2024\CA;
Результат один: Could not parse the JSON file.

ДА, я тоже грешил на кодировку, менял, результата нет. Если прописать значение с строкой подключения, уже другая ошибка:
System.ArgumentException: Format of the initialization string does not conform to specification starting at index 0.
at System.Data.Common.DbConnectionOptions.GetKeyValuePair(String connectionString, Int32 currentPosition, StringBuilder buffer, Boolean useOdbcRules, String& keyname, String& keyv
alue)
at System.Data.Common.DbConnectionOptions.ParseInternal(Dictionary`2 parsetable, String connectionString, Boolean buildChain, Dictionary`2 synonyms, Boolean firstKey)
at System.Data.Common.DbConnectionOptions..ctor(String connectionString, Dictionary`2 synonyms, Boolean useOdbcRules)
at System.Data.Common.DbConnectionStringBuilder.set_ConnectionString(String value)
at Microsoft.Data.SqlClient.SqlConnectionStringBuilder..ctor(String connectionString)
at CryptoPro.Util.Infrastructure.DbRoutineFactory.CreateMssqlRoutine(String connectionString)
at CryptoPro.Util.Infrastructure.DbRoutineFactory.CreateRoutine()
at CryptoPro.Util.Infrastructure.Commands.DeployDbCommandHandlerBase`1.DeployAsync(DeployMode deployMode, DatabaseOptionsBase options, Nullable`1 commandTimeout, ILogger logger)
at CryptoPro.Util.Infrastructure.Commands.DeployDbCommandHandlerBase`1.HandleAsync(TCommand command)
at Util.CommandBase.DbNewCmdBase`2.OnExecuteAsync(ICommandHandlerAsync`1 handler, IOptionsSnapshot`1 options, IConsole console, CommandLineApplication app)
Format of the initialization string does not conform to specification starting at index 0.

appsettings.zip (2kb) загружен 1 раз(а).

Пробовал вводить ./pkica ca db new -s SqlServer -c .\CA и ./pkica ca db new -s SqlServer -c UC-TEST1-2024\CA

Указал так ./pkica ca db new -s SqlServer -c "Data Source=.\CA;Initial Catalog=Ca;Integrated Security=True;Pooling=True" База Данных успешно развернулась. Спасибо Вам за помощь!