cannot import module in sub-directory

[MaxwellGengYF]

Xmake Version

2.7.9

Operating System Version and Architecture

Any platform

Describe Bug

with dir:
./my_lib.lua
./src/xmake.lua
code in any script-field in ./src/xmake.lua:
local my_lib = import("my_lib")
or:
local my_lib = import("../my_lib")

Neither can find my_lib successfully.

Expected Behavior

local my_lib = import("../my_lib")
should be available.

Project Configuration

No response

Additional Information and Error Logs

No response

[waruqi]

├── my_lib.lua
├── src
│   └── main.cpp
└── xmake.lua

xmake.lua

target("main")
    set_kind("binary")
    add_files("src/*.cpp")
    before_build(function (target)
        import("my_lib")
        my_lib()
    end)

i-2:test6 ruki$ xmake
checking for Xcode directory ... /Applications/Xcode.app
checking for Codesign Identity of Xcode ... Apple Development: [email protected] (E44X6YUK5E)
checking for SDK version of Xcode for macosx (x86_64) ... 13.0
checking for Minimal target version of Xcode for macosx (x86_64) ... 12.6
hello          <--------------
[ 25%]: cache compiling.release src/main.cpp
[ 50%]: linking.release main
[100%]: build ok, spent 1.173s

$ cat my_lib.lua
function main()
    print("hello")
end

[waruqi]

$ xmake
checking for Xcode directory ... /Applications/Xcode.app
checking for Codesign Identity of Xcode ... Apple Development: [email protected] (E44X6YUK5E)
checking for SDK version of Xcode for macosx (x86_64) ... 13.0
checking for Minimal target version of Xcode for macosx (x86_64) ... 12.6
hello
[ 25%]: cache compiling.release src/main.cpp
[ 50%]: linking.release test
hello      <------------------
[100%]: build ok, spent 0.541s

$ cat src/xmake.lua
target("test")
    add_files("*.cpp")
    after_build(function (target)
        import(".my_lib")
        my_lib()
    end)