Custom vault plugin programatic query of mount configuration/options

Vault
1

I’m implementing a custom plugin of type secret.
When enabling and mounting the plugin there exists to ability to add custom options via the following.

vault secrets enable -path=test \
        -options="custom_opt1=option1" \
        -options="custom_opt2=option2" \
        -description="I have custom options" \
        vault-plugin-custom

It is possible to read and write these options via the following vault commands.

vault read sys/mounts/test/tune
vault secrets tune -options "custom_opt1=newoption" test
vault write sys/mounts/test/tune "options=custom_opt1=newoption"

What is the recommend way to read these parameters within the plugin context using the sdk/logical and sdk/framework golang libraries?