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No, the s3Mixins are available only in nodejs. However the code is fairly straightforward to follow and reproduce: it just wraps creating a few other resources.
You can start here:
<https://github.com/pulumi/pulumi-aws/blob/db52cdc7e10e53ebb6e1b90c7c344f1faa462ed6/sdk/nodejs/s3/s3Mixins.ts#L248>
Which creates  an EventRuleEventSubscription:
<https://github.com/pulumi/pulumi-aws/blob/db52cdc7e10e53ebb6e1b90c7c344f1faa462ed6/sdk/nodejs/cloudwatch/eventRuleMixins.ts#L70>

You could easily rewrite the code in that class as a ComponentResource (and imo, Pulumi devs should probably do exactly that).