How to read a file in jenkins script for getting dynamic parameters?

Question

Jenkins

I want to make a dynamic display of the parameters, and take these parameters from the yaml file in the repository. Doesn't want to open the file, took out this piece in the stage, used only readYaml, it works, that is, it showed me the necessary parameters...

properties([
parameters([

[$class: 'ChoiceParameter',
choiceType: 'PT_SINGLE_SELECT', filterLength: 1, filterable: false,
name: 'DTARGET', randomName: 'choice-parameter-11997779855545603',
description: '''Select DataBase''',
script: [$class: 'GroovyScript',
script:[ sandbox: true,
script: "return [${targets.collect{'\'' + it + '
], fallbackScript: [sandbox: true, script: "return ['update_pipeline']"]
]
],

[$class: 'CascadeChoiceParameter',
choiceType: 'PT_SINGLE_SELECT', filterLength: 1, filterable: false,
description: ''' Available scripts to run ''',
name: 'COMMAND', randomName: 'choice-parameter-119975603',
script: [$class: 'GroovyScript',
script:[ sandbox: true,
script: '''
try{
String hosts_file = new File("${env.WORKSPACE}/sql_request/queries.yaml").text
Yaml yaml = new Yaml()
Object data = yaml.load(hosts_file)
queries = []
for (item in data[DTARGET])
{
queries.add(item.key)
}
return queries
} catch (Exception ex) {
return [ex.toString()]
}
''' // script
], fallbackScript: [ sandbox: true, script: 'return["ScriptError"]']
], referencedParameters: 'DTARGET'
]
])
])