EDIT: It seems this can be done on SnapEda website. I uploaded the entire Eagle library and then you can select the models you want to export and convert. I am testing the P2 one now, will update the post when I know whether it was successful.
Doing this in schematic would associate footprint with specific instance in that design only, where as above would associate a symbol library component with the footprint. Thus you don't have to do this association again in all new schematics created using these symbols.
I have been successful in importing a library in a DSN file. I have had no success in opening OrCAD files due to a lack of an OrCAD licence. I have had little success in opening BRD files. I'm not sure why.
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EasyEDA does not support exporting the Symbol or Footprint in Altium Designer library format, but you can place the libraries with the schematic or PCB and export that in Altium Designer format, and then extract the libraries from Altium Designer.