When trying to add SharePoint online web part with the target audience, I could not found SharePoint group?
How to set SP Group in the target audience?
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Sign up to join this communitySharePoint groups are not supported in audience targeting in SharePoint online.
Azure AD groups (including security groups and Microsoft 365 groups) are supported with the exception of AAD dynamic groups.
Documentation: Target content to a specific audience on a SharePoint site
Currently you can only use AD groups or Microsoft 365 groups to target audiences.
Source: Audience Targeting for Quick Links Web Part in SharePoint Online
You can vote on below similar SharePoint UserVoice:
Update about use of Azure AD Dynamic Groups: MC302460: Use of Azure Active Directory Dynamic Groups now supported for SharePoint Online audience targeting