[BUG] Need to convert exsting POJO to OpenApiformatted POJO

My use case is to convert existing POJO into openapi format POJO.

Question is POJO to new openapi formatted -POJO conversion supported?

### Executed below command:

openapi-generator-cli generate --import-mappings== -i -g java --language-specific-primitives=

Below exception is encountered:

[main] WARN i.s.v.p.util.DeserializationUtils - Error snake-parsing yaml content
io.swagger.v3.parser.util.DeserializationUtils$SnakeException: Exception safe-checking yaml content (maxDepth 2000, maxYamlAliasesForCollections 2147483647)
at io.swagger.v3.parser.util.DeserializationUtils$CustomSnakeYamlConstructor.getSingleData(DeserializationUtils.java:483)
at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:507)
at org.yaml.snakeyaml.Yaml.load(Yaml.java:436)
at io.swagger.v3.parser.util.DeserializationUtils.readYamlTree(DeserializationUtils.java:258)
at io.swagger.v3.parser.util.DeserializationUtils.deserializeIntoTree(DeserializationUtils.java:172)
at io.swagger.v3.parser.OpenAPIV3Parser.readContents(OpenAPIV3Parser.java:170)
at io.swagger.v3.parser.OpenAPIV3Parser.readLocation(OpenAPIV3Parser.java:97)
at io.swagger.parser.OpenAPIParser.readLocation(OpenAPIParser.java:16)
at org.openapitools.codegen.config.CodegenConfigurator.toContext(CodegenConfigurator.java:686)
at org.openapitools.codegen.config.CodegenConfigurator.toClientOptInput(CodegenConfigurator.java:744)
at org.openapitools.codegen.cmd.Generate.execute(Generate.java:527)
at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
Caused by: org.yaml.snakeyaml.scanner.ScannerException: mapping values are not allowed here

Reproduce the reported openapi-generator-cli command and trace the failure through DeserializationUtils, CodegenConfigurator, and Generate as shown in the stack trace. First establish whether the command accepts a Java POJO as input; done means either confirming the supported input format with a clear error or documenting and fixing the parsing behavior for a valid supported input.