Is your feature request related to a problem? Please describe.
Problem: I'd like to dynamically import scripts as <script> tags.

Describe the solution you'd like
Proposal:

const useScript = ({ url, id, type = 'text/javascript', async = true }) => {
    const [ready, setReady] = React.useState(false);
    const [failed, setFailed] = React.useState(false);

    R

Heston model has accurate density approximations for European option prices, which are of interest.

The module implementing this method should live under tf_quant_finance/volatility/heston_approximation.py. It should support both European option puts and calls approximations. Tests should be in heston_approximation_test.py in the same folder.