Impossible to connect many-to-many relation in one step

[ToP29]

When i create record datum, which has connection to user, i cannot connect it in same mutation where I create it, because nested mutation wants dataId and i dont have that yet, until datum is created.

const req: Request<MutationCreateDatumArgs> = {
		mutation: CreateDatum,
		variables: {
			input:{
			userData: {
				connectByUserIdAndDataId: [
					{
						dataId: null, // I dont have this yet
						userId: 'Hn67I7nMY9TcBnXsH32UOgFToBf1'
					}
				]
			}
		}
	}