Just saying, Gowin has a Aurora (or their next generation architecture) based FPGA with at least a 1GHz+ dual core RV64G CPU complex on their roadmap, and I have gave them the idea to embed 1.2V DDR4 SDRAM with that FPGA (since their FPGA of that generation will use 1.2V core voltage, the VCORE pins on that design would supply not only the FPGA core but also the DDR4 I/O bank and the MCP DDR4 die.)
I hope we can see that FPGA with dual-core RV64G and 1GB embedded DDR4 memory soon, hopefully still in that QFN88 package.