create rule with context:

gistfile1.php

<?php

    $rule = $this->expressionManager->createRule([
      'context_definitions' => [
        'test' => [
          'type' => 'string',
          'label' => 'Test string',
        ],
      ],
    ]);

    $rule->addCondition('rules_test_string_condition', [
      'context_mapping' => ['text:select' => 'test'],
    ]);

    $rule->addAction('rules_test_log');
    $rule->setContextValue('test', 'test value');
    $rule->execute();

Environment
ExpressionEnvironment