No, you can’t get an ATPL online.
Your first step would be converting your FAA PPL to an EASA PPL. You will then need to add Instrument, Commercial Single-Engine, Commercial Multi-Engine, Multi-Crew Commercial and frozen ATP ratings. All of that will require ground instruction, flight instruction, written tests and checkrides. Then you will need to build time until 1500 hours to get your ATPL unfrozen. There are some differences in process and terminology between FAA and EASA, of course, but the end result will require roughly the same skills and experience because both systems have to meet the same ICAO standards.
COVID-19 has not changed the requirements to get a license, just the feasibility of actually meeting them. Many flight schools are closed, those that are open may not be accepting foreign students, and you may not be able to get there at all due to border restrictions.