Hi @Bishwas Ghimire , Thanks for using Microsoft Q&A Platform.
Here are the features that are support by the Document Translation and the supported glossary format for your reference.
Source: [https://learn.microsoft.com/en-us/azure/cognitive-services/translator/document-translation/overview#document-translation-key-features
With the custom translator feature, you can train the model with your own terminology and glossaries to improve the quality of the translation. In such a case, Custom Translator is recommended. You can always try which option is best for your use case.
I hope it helps.
Regards,
Vasavi