schema.json

{
    "$schema": "http://json-schema.org/draft-07/schema#",
    "type": "array",
    "items": {
        "type": "object",
        "required": ["id", "en_text"],
        "properties": {
            "id": {
                "type": "string"
            },
            "en_text": {
                "type": "string"
            },
            "el_text": {
                "type": "string"
            },
            "field1": {
                "type": "string"
            },
            "field2": {
                "type": "string"
            },
            "useful_modal_verbs": {
                "type": "array"
            },
            "useful_action_verbs": {
                "type": "array"
            },
            "useful_possession_verbs": {
                "type": "array"
            },
            "useful_categorization_verbs": {
                "type": "array"
            },
            "useful_proper_nouns": {
                "type": "array"
            },
            "useful_nouns": {
                "type": "array"
            },
            "useful_adjectives": {
                "type": "array"
            }
        },
        "anyOf": [
            {
                "required": ["useful_modal_verbs", "useful_action_verbs", "useful_possession_verbs", "useful_categorization_verbs", "useful_proper_nouns", "useful_nouns", "useful_adjectives"]
            },
            {
                "not": {
                    "anyOf": [
                        {
                            "required": ["useful_modal_verbs"]
                        },
                        {
                            "required": ["useful_action_verbs"]
                        },
                        {
                            "required": ["useful_possession_verbs"]
                        },
                        {
                            "required": ["useful_categorization_verbs"]
                        },
                        {
                            "required": ["useful_proper_nouns"]
                        },
                        {
                            "required": ["useful_nouns"]
                        },
                        {
                            "required": ["useful_adjectives"]
                        }
                    ]
                }
            }
        ]
    }
}