Unfortunately, Sendgrid and other users of Authy with no alternative 2FA systems in place lock you into the Authy app or SMS as the fallback. There are some, very limited, workarounds for this but still requires you to have the app in Authy.
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On a recent find apparently Authy (the app not the sms fallback) has a weird, uh, “feature?”, where my 2fa, for example, for Sendgrid will unlock all of my Sendgrid accounts, which I personally find mildly concerning.
If you load your Sendgrid Authy 2FA on a rooted android phone, you can extract the TOTP secret that powers it under the hood and put it in Bitwarden like you prefer.
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On a recent find apparently Authy (the app not the sms fallback) has a weird, uh, “feature?”, where my 2fa, for example, for Sendgrid will unlock all of my Sendgrid accounts, which I personally find mildly concerning.