Working fontconfig

local.conf

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>

    <!-- Turn off embedded font -->
    <match target="font">
        <edit name="embeddedbitmap" mode="assign">
            <bool>false</bool>
        </edit>
    </match>

    <!-- Disable undesirable fonts -->
    <selectfont>
        <rejectfont>
            <pattern>
                <patelt name="family" >
                    <string>KanjiStrokeOrders</string>
                </patelt>
            </pattern>
            <pattern>
                <patelt name="family" >
                    <string>AR PL KaitiM Big5</string>
                </patelt>
            </pattern>
            <pattern>
                <patelt name="family" >
                    <string>AR PL Mingti2L Big5</string>
                </patelt>
            </pattern>
            <pattern>
                <patelt name="family" >
                    <string>AR PL KaitiM GB</string>
                </patelt>
            </pattern>
            <pattern>
                <patelt name="family" >
                    <string>AR PL SungtiL GB</string>
                </patelt>
            </pattern>
        </rejectfont>
    </selectfont>

    <!-- Latin fonts
    <match>
        <test qual="any" name="family">
            <string>serif</string>
        </test>
        <edit name="family" mode="prepend" binding="strong">
            <string>Noto Serif</string>
        </edit>
    </match>
    <match target="pattern">
        <test qual="any" name="family">
            <string>sans-serif</string>
        </test>
        <edit name="family" mode="prepend" binding="strong">
            <string>Roboto</string>
        </edit>
    </match>
    <match target="pattern">
        <test qual="any" name="family">
            <string>monospace</string>
        </test>
        <edit name="family" mode="prepend" binding="strong">
            <string>DejaVu Sans Mono</string>
        </edit>
    </match>
    -->

    <!-- Chinese fonts -->
    <match>
        <test name="lang" compare="contains">
            <string>zh</string>
        </test>
        <test name="family">
            <string>serif</string>
        </test>
        <edit name="family" mode="prepend">
            <string>Source Han Serif CN</string>
        </edit>
    </match>
    <match>
        <test name="lang" compare="contains">
            <string>zh</string>
        </test>
        <test name="family">
            <string>sans-serif</string>
        </test>
        <edit name="family" mode="prepend">
            <string>Source Han Sans CN</string>
        </edit>
    </match>
    <match>
        <test name="lang" compare="contains">
            <string>zh</string>
        </test>
        <test name="family">
            <string>monospace</string>
        </test>
        <edit name="family" mode="prepend">
            <string>Noto Sans Mono CJK SC</string>
        </edit>
    </match>

    <!-- Japanese fonts -->
    <match>
        <test name="lang" compare="contains">
            <string>ja</string>
        </test>
        <test name="family">
            <string>serif</string>
        </test>
        <edit name="family" mode="prepend">
            <string>Source Han Serif JP</string>
        </edit>
    </match>
    <match>
        <test name="lang" compare="contains">
            <string>ja</string>
        </test>
        <test name="family">
            <string>sans-serif</string>
        </test>
        <edit name="family" mode="prepend">
            <string>Source Han Sans JP</string>
        </edit>
    </match>
    <match>
        <test name="lang" compare="contains">
            <string>ja</string>
        </test>
        <test name="family">
            <string>monospace</string>
        </test>
        <edit name="family" mode="prepend">
            <string>Noto Sans Mono CJK JP</string>
        </edit>
    </match>

    <!-- Windows & Linux Chinese fonts -->
    <!-- Replace frequently-used Windows & Linux fonts when missing -->
    <match target="pattern">
        <test qual="any" name="family">
            <string>WenQuanYi Zen Hei</string>
        </test>
        <edit name="family" mode="assign" binding="same">
            <string>Source Han Sans CN</string>
        </edit>
    </match>
    <match target="pattern">
        <test qual="any" name="family">
            <string>WenQuanYi Micro Hei</string>
        </test>
        <edit name="family" mode="assign" binding="same">
            <string>Source Han Sans CN</string>
        </edit>
    </match>
    <match target="pattern">
        <test qual="any" name="family">
            <string>WenQuanYi Micro Hei Light</string>
        </test>
        <edit name="family" mode="assign" binding="same">
            <string>Source Han Sans CN</string>
        </edit>
    </match>
    <match target="pattern">
        <test qual="any" name="family">
            <string>Microsoft YaHei</string>
        </test>
        <edit name="family" mode="assign" binding="same">
            <string>Source Han Sans CN</string>
        </edit>
    </match>
    <match target="pattern">
        <test qual="any" name="family">
            <string>SimHei</string>
        </test>
        <edit name="family" mode="assign" binding="same">
            <string>Source Han Sans CN</string>
        </edit>
    </match>
    <match target="pattern">
        <test qual="any" name="family">
            <string>SimSun</string>
        </test>
        <edit name="family" mode="assign" binding="same">
            <string>Source Han Serif CN</string>
        </edit>
    </match>
    <match target="pattern">
        <test qual="any" name="family">
            <string>SimSun-18030</string>
        </test>
        <edit name="family" mode="assign" binding="same">
            <string>Source Han Serif CN</string>
        </edit>
    </match>
</fontconfig>