是的，有一个默认方法，它将AssetManager作为参数：

/**
 * Create a Font declaration from a file in the assets directory. The content of the [File] is
 * read during construction.
 *
 * @param assetManager Android AssetManager
 * @param path full path starting from the assets directory (i.e. dir/myfont.ttf for
 * assets/dir/myfont.ttf).
 * @param weight The weight of the font. The system uses this to match a font to a font request
 * that is given in a [androidx.compose.ui.text.SpanStyle].
 * @param style The style of the font, normal or italic. The system uses this to match a font to a
 * font request that is given in a [androidx.compose.ui.text.SpanStyle].
 */
@ExperimentalTextApi
@OptIn(InternalPlatformTextApi::class, ExperimentalTextApi::class)
@Stable
fun Font(
    assetManager: AssetManager,
    path: String,
    weight: FontWeight = FontWeight.Normal,
    style: FontStyle = FontStyle.Normal
): Font = AndroidAssetFont(assetManager, path, weight, style)

现在访问字体像这样！

@OptIn(ExperimentalTextApi::class)
@Composable
fun fontFamily() = FontFamily(
    Font(LocalContext.current.assets,"myfont.ttf")
)

@Composable
fun typography() = Typography(

    h1 = TextStyle(
        fontFamily = fontFamily(),
        fontWeight = FontWeight.Bold,
        fontSize = 30.sp
    )
)

1.在res中创建字体目录（res/font）
1.复制res中的.ttf字体/font
1.找到Type.kt文件（在ui/theme目录中）
1.在Type.kt中创建字体变量

val MyCustomFont = FontFamily(
    Font(R.font.regular),
    Font(R.font.bold,FontWeight.Bold)
)

1. Type.kt文件中存在字体瓦尔，您可以通过在此值中输入defaultFontFamily = MyCustomFont来更改整个应用程序的字体系列

val Typography = Typography(
    defaultFontFamily = MyCustomFont,
    body1 = TextStyle(
        fontFamily = MyCustomFont2,
        fontWeight = FontWeight.Normal,
        fontSize = 16.sp
 ),

1.你可以设置字体系列到特定的排版如body 1，h1，h2，...
编辑：要更改材料3的字体，请在Type.kt中添加以下内容

bodyLarge = TextStyle(
    fontFamily = MyCustomFont,
    fontWeight = FontWeight.Normal,
    fontSize = 16.sp,
    lineHeight = 24.sp,
    letterSpacing = 0.5.sp
),
displayLarge= TextStyle(fontFamily = MyCustomFont),
displayMedium= TextStyle(fontFamily = MyCustomFont),
displaySmall= TextStyle(fontFamily = MyCustomFont),
headlineLarge= TextStyle(fontFamily = MyCustomFont),
headlineMedium= TextStyle(fontFamily = MyCustomFont),
headlineSmall= TextStyle(fontFamily = MyCustomFont),
titleLarge= TextStyle(fontFamily = MyCustomFont),
titleMedium= TextStyle(fontFamily = MyCustomFont),
titleSmall= TextStyle(fontFamily = MyCustomFont),
bodyMedium= TextStyle(fontFamily = MyCustomFont),
bodySmall= TextStyle(fontFamily = MyCustomFont),
labelLarge= TextStyle(fontFamily = MyCustomFont),
labelMedium= TextStyle(fontFamily = MyCustomFont),
labelSmall= TextStyle(fontFamily = MyCustomFont),

实际上，在composition中，通常有一个名为Typography.kt的类，它被MaterialTheme Composable使用。正如主题代码实验室中所描述的，正确的方法是修改这个类以向其添加字体。实际上，你可以创建自己的mAppTheme来覆盖Material的。
https://youtu.be/DDd6IOlH3io?t=6m27s
本视频演示如何实现自定义调色板，但也可以采用类似的方法来实现自定义版式。
查看JetSnack示例应用https://github.com/android/compose-samples