Currently the Data Lookup (Data Connector) on skybow's Modern Forms supports SharePoint lists and libraries from other site collections as source for a lookup control ("Cross-SiteCollection Lookup") + the selection of MS Teams.
More Data Connectors to connect and select data from other sources than SharePoint is high requested in business cases (Ideas: MS Dataverse, SAP, MS Dynamics, SQL, etc.).
Therefore we're planning to implement other connectors (and controls) to bring that functionality to Modern Forms.