Hong Kong and Japan has a directory too. The best way is to have LGBTQ colleagues say you are. Voices from trans, women, people of colour, and folks with disabilities will count for more.
Show actively that you have policies such as gender neutral washrooms or benefits for same sex partners.
And if you have no lgbtq colleagues and are a really open company, It should reflect in your language. The really inclusive companies are obvious to those who are looking, such as what terminology you use, how your recruitment team phrases hiring copy, what Twitter accounts share.