@DTFSaracen - There is currently native no Visio + Miro integration, and Miro does not make their product backlog public.

Your best bet is to upvote the following Wish List idea post - you may also want to leave a reply as a means of subscribing to the post to receive future updates.

https://community.miro.com/ideas/visio-integration-663

@DTFSaracen Just to add to what @Robert Johnson said, if you don’t want to leave a comment you can still subscribe to the post. Simply click Subscribe beneath the original message. (On Mobile, it’s just a star icon  with no text)

@DTFSaracen - You may want to subscribe to this post: https://community.miro.com/ask-the-community-45/import-from-lucidchart-8481

In addition to Henrik's note about, you can get to your Subscribed posts by going to your Favourites page (pick a name, inSided):

https://community.miro.com/ask-the-community-45/have-team-account-voting-not-available-on-some-boards-8456?postid=35723#post35723