It might get complicated down the line if we did that. Deadpool 3, for example, brings in the entire X-Men franchise. What are we supposed to call X-Men: First Class? It's technically Earth-10005, Earth-66250, Earth-41633, Earth-17315 and Earth-18315 at the same time. What about The Gifted? That show is intended to be in the Days of Future Past timeline according to the latest statement by Matt Nix (
sorry Blink). The wiki has it with it's own number because the statements have also been murky. Helstrom also has it's own TRN number despite being set in the MCU. TRNs in general are fan-made for use on the Marvel wiki.
Not to mention realities without even a temporary number, such as:
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I mean, you can make it an MCU Multiverse timeline if you like. Viewing Order gets a little wacky with the SSU involved, but sure.