Since your requirements are not clear, it's hard to answer your question. In general I'd say though the answer is no, because the simplified API the SAP JCo IDoc library provides (especially for sending or receiving IDocs) does not account for getting/sending other data at the same time.
The part that's unclear to me is whether you're talking about a JCo client (data is pulled from SAP by the external Java client) or a server (data is pushed out from SAP to the external JCo server). In either way the IDoc sent from SAP is (unless you use XML) most likely already in the form of tables (i.e. EDIDC and EDIDD or the more specific structures depending on SAP version). E.g. you can take a look at function module IDOC_INBOUND_ASYNCHRONOUS and there you can see that the IDoc basically is specified as data in internal tables. The JCo IDoc library provides a layer around that though, which hides this, but also restricts you in what you can do.
If you have to combine the data in one RFC call (not sure if this really is a requirement for you), then probably your only chance for using JCo IDoc library is to encode the table data in your IDoc (i.e. add custom segments like Z1VBAK, Z1VBEP, etc. and store the data within the IDoc).
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