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You cannot claim a free copy of Halo if you own the 360 version. But if you have a few dollars to spare you can get a month of Game Pass Ultimate for $1/£1 and play it through the Xbox app on Windows 10.
https://www.microsoft.com/en-gb/p/xbox-game-pass/CFQ7TTC0KGQ8
https://support.steampowered.com/kb_article.php?ref=5414-tfbn-1352
It's possible to register a game you own and have a key for on Steam but not all of them are accepted by steam. The ones that are accepted and how they're accepted or why a key you have might get denied or say it's invalid are explained at the link above.
At the top of the steam client window click on Games > Activate a Product on Steam...
IF it is an accepted game that outside key registrations work for, depending on the game, it may or may not save your progress that you have on another platform or locally on your pc from the disk installation. It will install the Steam version and might be separate.
For games you do this with be sure to read details of any workshop or DLC items you want to buy for it. In most cases DLC available only on steam and workshop items only work on the steam version. Read the text on the store pages. They will warn / tell you whether the DLC works with stand-alone installations or steam only.
Too many people make the lazy mistake of not reading the store page text. And I've seen people complain that after they registered a product key on to steam "My stuff isn't there! I have to start all over!"
It's a different installation. Your stuff might not be carried over to the steam version of it if you have modifications in your stand-alone version. You'll have to manually install 3rd party mods not available on steam to the steam version for them to work, if they're compatible. They might not be compatible. Please be aware of these things.
Also take note that there is no collaboration between Steam and Microsoft. Like any other publisher, Microsoft puts games on the Steam store.
https://www.windowscentral.com/do-i-need-xbox-live-account-play-halo-mcc-pc
https://store.steampowered.com/news/?appids=976730
https://support.halowaypoint.com/hc/en-us/articles/360037080832-Installation-Instructions
Google is your friend.