Does BIP-174 (PSBT v0) allow the creation and serialization of a PSBT with no inputs and one or more outputs?

I’m trying to understand whether BIP-174 (PSBT v0) supports creating a PSBT that initially has no inputs but contains one or more outputs.

The intended flow is:

1. User A creates a PSBT with no inputs and one or more outputs (such as a payment request).

2. Person A serializes it to Base64 and sends it to Person B.

3. Person B deserializes it, adds their own inputs (and possibly modified outputs), signs it, and broadcasts the final transaction.

However, when I try this using bitcoinjs-lib (problem), the deserialization fails because PSBT has no input.

My question is:

1. Does BIP-174 (PSBT v0) officially allow zero-input PSBT?
2. If not, is there a supported way to achieve this “output only → add input later” workflow in PSBT v0?
3. Is BIP-370 (PSBT v2) required for this type of multiparty build?