[olliej]

You shouldn’t, but if you do tell them in writing only to protect yourself against being fired.

Assuming you’re employed by big tech in the US you’re likely in an at will state. That doesn’t mean they can fire you for any reason, as many reasons are illegal.

So if they do fire you, even if they claim there’s “no reason”, if dismissal happens after they’re informed, or after you request “reasonable” accommodation you want that sequence of events documented to show that your dismissal is in response to that information, which is generally illegal. Similarly your performance reviews might suddenly nose dive, to try to create “justification”. In any event document trail is something you need.