VenuReddy There's no workaround on GrapheneOS.
If you know what you're doing, you could modify GrapheneOS code spoofing a legacy/other device and then build your own fork of it. Even if you did do that, it would only work for a short amount of time. The project considered doing just that to get around Play Integrity, but it was decided against for good reasons. See this comment and this next one by the same person explaining why.