Issue returning values with RXJS and Nestjs

Question

I'm getting some JSON from an endpoint (I'm using @nestjs/axios for this). The issue is that the response is an Observable. This complicates things when returning values. I can't seem to get async/await to work, I'm truly out of ideas...

Here's my endpoint:

async getBalance({ address, network }: WalletDto): Promise<any> {
    let nativeBalance: string

    try {
      this.httpService
        .get<{ balance: string }>(
          `https://deep-index.moralis.io/api/v2/${address}/balance?chain=${network}`,
          {
            headers: {
              Accept: 'application/json',
              'X-Api-Key': 'lol',
            },
          },
        )
        .subscribe({
          next: ({ data }) => {
            nativeBalance = utils.formatEther(data.balance)
          },
          complete: () => {
            const chain = supportedChains.find(
              ({ name }) => name.toLowerCase() === network,
            )

            return {
              chain,
              nativeBalance,
            }
          },
        })
    } catch (error) {
      // TODO handle error
    }
  }

I've messed around with .pipe() but don't understand what it does or how it works... Btw, supportedChains is a static array, not part of the fetch.