BaselineShift

import androidx.compose.material.Text
import androidx.compose.ui.text.SpanStyle
import androidx.compose.ui.text.buildAnnotatedString
import androidx.compose.ui.text.style.BaselineShift
import androidx.compose.ui.text.withStyle
import androidx.compose.ui.unit.sp

Text(
    fontSize = 20.sp,
    text =
        buildAnnotatedString {
            append(text = "Hello")
            withStyle(SpanStyle(baselineShift = BaselineShift.Superscript, fontSize = 16.sp)) {
                append("superscript")
                withStyle(SpanStyle(baselineShift = BaselineShift.Subscript)) {
                    append("subscript")
                }
            }
        }
)

import androidx.compose.material.Text
import androidx.compose.ui.text.SpanStyle
import androidx.compose.ui.text.buildAnnotatedString
import androidx.compose.ui.text.style.BaselineShift
import androidx.compose.ui.text.withStyle

val annotatedString = buildAnnotatedString {
    append("Text ")
    withStyle(SpanStyle(baselineShift = BaselineShift.Superscript)) { append("Demo") }
}
Text(text = annotatedString)