DBISAM is not available in Freepascal. It is a closest source commercial product.
So you would have to write your exporter in D2007 first. (Preferably directly to Sqlite3 or CSV )
You can subsequently use your exported data in Lazarus/FreePascal.
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According to the official website:
"Both DBISAM and ElevateDB can be compiled directly into any Delphi, Lazarus, or C++Builder application, providing small, fast, and embedded native code execution. No DLLs and no external configuration via the Windows registry required."
So you should be able to buy a Lazarus version if DbIsam if so required...
If you have the sourcecode edition it will probably compile in FPC, emulating D2007 or D7