Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
I suggest to try create a GDB Hardware debug configuration then configure it to communicate with JLink GDB server (should be started manually, or using external program config from eclipse)